My kale bed has gotten out of hand. I picked a full colander on Monday, and by Wednesday the plants had closed the gap like nothing happened. Anyone who has grown kale knows this feeling — it isn't a harvest, it's a standing obligation.
So I did what my mother would have done, which is not what most American kale advice tells you to do. I blanched it, squeezed it dry, and dressed it with garlic, soy sauce, and sesame oil. Kale namul. In Korean, 케일나물.
And standing at the sink squeezing a green ball of leaves the size of a tennis ball — down from an entire colander — I realized something. Korean cooking already solved the abundant-leafy-green problem. It solved it a long time ago, at scale, for a whole category of vegetables. The technique is called namul, and it exists precisely because a farming household in autumn has more greens than it can eat that day.
Americans discovered kale about fifteen years ago and immediately decided it was a salad. Which is fine. But salad doesn't solve abundance — you still have to eat the same volume of leaves. Namul does. It shrinks a colander into a bowl, keeps five days, and gets better on day two.
What namul actually is, if you haven't met it
If you've eaten at a Korean restaurant, you've had namul without necessarily learning the word. Those small side dishes that arrive before the meal — the bowl of dark green spinach glossed with sesame oil is 시금치나물, sigeumchi namul. Spinach namul. It's probably the single most common one on a Korean table.
The method underneath it is almost boringly simple:
- Blanch the greens briefly
- Shock them in ice water
- Squeeze out every drop of water
- Season by hand with garlic, sesame oil, soy or salt
That's it. That's the whole architecture. Swap the green and you have a different dish — bean sprouts, radish greens, young zucchini, fernbrake, chard. Kale slots in without any argument.
Step 3 is the one everyone underestimates. Squeezing isn't a tidiness step. It's the seasoning step. Water left in the leaves dilutes everything you add afterward, and the difference between namul that tastes seasoned and namul that tastes vaguely of wet grass is entirely how hard you wrung it out.
Kale namul vs. spinach namul — what actually changes
Kale is not a drop-in replacement for spinach, and pretending otherwise is how people end up disappointed. Three real differences:
Kale needs longer in the water. Spinach wants 30 to 40 seconds — it's practically instant. Kale wants 90 seconds, and thick late-summer leaves closer to two minutes. Under-blanched kale stays squeaky and tough.
Kale keeps its shape; spinach collapses. Spinach namul goes soft and slippery. Kale namul stays leafy and has actual chew. Whether that's better is a matter of taste, but it's noticeably a different mouthfeel, and it holds up better in a lunchbox.
Kale can be bitter; spinach is sweet. Especially in a hot summer, kale gets a hard edge. Sugar doesn't really fix it — acid does. A splash of rice vinegar at the end cuts summer bitterness far better than sweetening it.
And kale lasts. Spinach namul is best the day it's made. Kale namul is genuinely better on day two and holds four to five days in the fridge. For a green you're drowning in, that's the entire point.
The health part — and this one's personal
I'll be honest about why I care about this beyond the recipe.
I have iron-deficiency anemia. Heavy periods, which my doctor tells me is a common perimenopausal pattern — the hormonal swings before menopause can make bleeding heavier and less predictable, and roughly a third of women with heavy menstrual bleeding end up anemic because of it. That's not a rare or dramatic thing. It's just something a lot of women in their forties are quietly dealing with while assuming they're merely tired.
So when I read about leafy greens and iron, I read carefully. And I want to tell you what I actually found, including the part that isn't flattering to kale.
What kale genuinely does well
Its calcium and iron aren't locked up. This is the real headline, and it's the specific thing that separates kale from spinach. Spinach is loaded with oxalates — compounds that bind minerals and drag them out of your body unabsorbed. Kale is a low-oxalate green. The numbers are stark: a 300g serving of spinach carries about 6.6 mmol of oxalate; the same amount of kale carries about 0.1 mmol.
The consequence shows up in absorption studies. You absorb roughly 5% of spinach's calcium. From kale, about 40% — and a study in the American Journal of Clinical Nutrition measured kale's fractional calcium absorption at 0.409 against milk's 0.321. Kale beats milk. The same pattern holds for magnesium: 36.5% absorbed from a kale meal versus 26.7% from a spinach meal.
So the old line about spinach making you strong was always a little oversold. The iron is in there; you just don't get much of it.
It's a vitamin C powerhouse, and that matters more than the iron number. Raw kale runs roughly 90–120 mg of vitamin C per 100 g — about double an orange by weight. Vitamin C converts the plant-based iron in your food into the form your gut can actually take up. Pairing vitamin C with non-heme iron is often more effective than chasing high-iron foods in the first place.
Vitamin K, in serious quantity. Kale is among the highest food sources on earth — well over triple a day's requirement in 100 g. There's an interesting thread in the research here: vitamin K is central to blood clotting, and a 2026 review in Clinical and Experimental Obstetrics & Gynecology found that acquired vitamin K deficiency may contribute to heavy menstrual bleeding, and should be considered when menorrhagia is otherwise unexplained. I want to be careful with that — it's a narrative review, not proof that eating kale lightens your period. But it's a real line of inquiry and I found it worth knowing.
Folate, which your body needs to build red blood cells at all.
What kale does not do
Kale is not an iron supplement. It has about 1.5 mg of iron per 100 g, which is respectable for a vegetable and nowhere near what you need if you're actually anemic. Anyone telling you a green smoothie will fix iron-deficiency anemia is selling something.
If your periods are heavy enough to make you anemic, that deserves an actual doctor — a ferritin test, and a conversation about why the bleeding is heavy, because fibroids, polyps, and thyroid problems all cause it and all have their own treatments. Food supports the treatment. It isn't the treatment. I take what my doctor prescribed, and I eat the kale, and I don't confuse the two.
Two cautions worth stating
If you take warfarin or another vitamin K–sensitive blood thinner, talk to your doctor before eating kale regularly. This is not a small footnote. Vitamin K directly opposes how warfarin works, and kale is one of the highest-vitamin-K foods there is. The advice is usually consistency rather than avoidance — but that's your doctor's call, not a blog's.
If you have a thyroid condition, cook it. Raw brassicas contain goitrogens that can interfere with thyroid function. Cooking substantially reduces them — which, conveniently, is exactly what namul does. This is one more reason the Korean method suits kale better than the salad bowl.
And one thing the recipe itself changes
Blanching is a trade. Vitamin C is water-soluble and some of it leaves in the pot — so a long boil is genuinely costly. But heat also breaks down cell walls, which improves absorption of calcium, iron, and beta-carotene, and it knocks down goitrogens.
The practical answer is the short blanch. Ninety seconds, not five minutes. And squeeze the leaves rather than rinsing them under a running tap. Then, if you want the vitamin C back for iron absorption, eat the namul alongside something raw and bright — that rice vinegar at the end, a side of tomatoes, a piece of fruit after the meal.
Kale Namul (케일나물)
Serves 4 as a side · 15 min active, 25 min total · Keeps 4–5 days refrigerated
Ingredients
- 450 g (1 lb) kale leaves, stems removed
- 1 tbsp fine sea salt, for the blanching water
- 1½ tbsp soy sauce
- 1 tbsp toasted sesame oil
- 2 garlic cloves, finely minced
- 1 tsp sugar
- 1 tbsp toasted sesame seeds
- ½ tsp gochugaru (optional)
- 1 scallion, thinly sliced
Method
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Prep the leaves. Strip the kale from its stems and wash well — garden kale hides grit and the occasional caterpillar. Leave the leaves whole for now; they're easier to handle in the pot.
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Blanch, 90 seconds. Bring a large pot of water to a rolling boil with the salt. Add the kale and cook until the leaves turn deep green and go limp. Older, thicker leaves may want closer to 2 minutes.
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Shock and squeeze. Drain and plunge straight into ice water to stop the cooking and hold the color. Once cool, gather the kale into a ball and squeeze out as much water as you can. This is the step that decides whether the dish tastes seasoned or watery.
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Season. Chop into 1-inch pieces and loosen in a bowl. Add the soy sauce, sesame oil, garlic, sugar, sesame seeds, gochugaru, and scallion. Mix with your hands, rubbing the seasoning into the leaves rather than stirring.
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Rest 10 minutes. Taste and adjust — more soy for salt, more sesame oil for roundness.
Notes
- If your kale is bitter from summer heat, add a splash of rice vinegar at the end. Acid cuts bitterness more effectively than sugar does.
- Don't skip the ice bath. It's the difference between olive-drab and bright green.
- Blanch and freeze: squeeze the blanched kale into tennis-ball portions, wrap, and freeze. It thaws straight into soups all winter. This is how a Korean household banks an autumn surplus, and it works exactly as well in a Hudson Valley kitchen.
Three more, for when the bed still isn't empty
Namul handles volume better than anything else, but it isn't the only answer. Sort your leaves by age and each pile has a job.
Massaged kale salad with lemon and almonds — for the young center leaves
Slice tender leaves into thin ribbons. Whisk 2 tbsp olive oil, the juice of a lemon, a grated garlic clove, ½ tsp honey, and ½ tsp salt in a big bowl. Add the kale and work the dressing in with your hands for three full minutes — squeezing and rubbing until the leaves darken, shrink by a third, and go soft. Rest 10 minutes, then toss through grated Parmesan and toasted sliced almonds.
Massaging does mechanically what blanching does with heat: it breaks down cell walls. Same principle, no pot. And because nothing is boiled, this one keeps all its vitamin C — worth knowing if you're eating for iron absorption.
Ten-minute garlic sautéed kale — the weeknight default
Put 2 tbsp olive oil and 3 thinly sliced garlic cloves in a cold wide skillet, then set it over medium heat — starting cold perfumes the oil instead of scorching the garlic. When it's pale gold, add a pinch of red pepper flakes, then the kale in handfuls. Add 3 tbsp water and ½ tsp salt, cover, and steam 3 minutes. Uncover, raise the heat, cook off the liquid until the leaves sizzle and catch a little color. Squeeze lemon over the top off the heat.
Don't compost the stems — slice them thin and start them a few minutes ahead of the leaves. They're sweet and crunchy.
Kale and white bean soup — for the big tough late-season leaves
The ones you'd almost given up on are the ones this wants. Sweat a diced onion, 2 carrots, and 2 celery stalks in olive oil until soft, 8–10 minutes. Add 4 minced garlic cloves and 2 tbsp tomato paste and cook until the paste darkens to brick red — that step is the difference between a flat soup and a savory one. Add 1.2 l stock, two drained cans of cannellini beans, a rosemary sprig, and a Parmesan rind. Simmer 15 minutes, then stir in 350 g chopped mature kale and simmer another 15–20 until tender. Blend a cup of the beans and broth and stir it back in to thicken.
Tender kale disintegrates in soup. Tough kale holds its shape for half an hour and gives the broth its body. The flaw is the requirement.
The thing I keep coming back to
Kale arrived in the American mainstream as a health food — a smoothie ingredient, a nutrition score, something you eat on purpose rather than something you cook. Korean cooking never met it that way, because Korean cooking doesn't really have a category for "health food." It has a category for what you do with a lot of leaves in August.
Which, it turns out, is also the healthier way to eat it. Cooked kale gives up more of its calcium and beta-carotene, drops its goitrogens, and — squeezed and seasoned and sitting in the fridge — actually gets eaten instead of wilting in the crisper drawer.
The best nutrition advice is usually just a technique for finishing the vegetable.
Sumi | NYC + Hudson Valley | @miguktv on YouTube
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What's the vegetable your garden keeps giving you more of than you know what to do with? I'm collecting solutions — tell me in the comments.
This post describes my own experience and general nutrition research. It isn't medical advice. If you think you're anemic, please get a ferritin test rather than a smoothie.
kale, kale namul, banchan, Korean side dish, garden harvest, Hudson Valley garden, kale nutrition, oxalates, iron deficiency anemia, spinach namul, sigeumchi namul, vegetable garden, miguktv
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