Bok Choy & Tempeh Noodle Bowl with Peanut Sauce
Whole wheat noodles tossed with pan-fried tempeh, stir-fried bok choy and sweet potato cubes, finished with a peanut sauce you mix in thirty seconds. 883 calories and 38 grams of protein from plants, ready in fifteen minutes.
Tempeh earns its spot here for a reason most recipe pages never mention. The fermentation that turns soybeans into tempeh breaks down phytic acid — the compound that normally blocks the body from absorbing iron, zinc, and calcium. By the time you open the package, that barrier has already been reduced. This bowl pairs that fermented protein with whole wheat noodles and soy sauce — three independent mechanisms that help the body access more minerals from one plant-based meal.
Ingredients
- baby bok choy 2 heads
- sweet potato 0.25 pound
- garlic 1 clove
- tempeh 3 ounces
- olive oil 1.5 tablespoon
- noodles, whole wheat 3 ounces
- soy sauce 1 tablespoon
- peanut butter 1 tablespoon
- honey 0.5 teaspoon
- water 3 tablespoons
Method
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Slice a piece off the bottom of the bok choy and separate the leaves. Cut the bok choy leaves into strips and set the green part aside. Peel the sweet potato and cut it into small cubes. Crush the garlic clove. Cut the tempeh into cubes.
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Heat half of the oil in a wok and add the sweet potato cubes. Cook for about 7 minutes over medium heat. Then, add half of the garlic and the white part of the bok choy. Stir-fry for 3 minutes. Add the green bok choy and cook for another 2 minutes.
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Cook the noodles according to the package instructions.
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Heat the other half of the oil in a frying pan and fry the tempeh cubes for 3-4 minutes until golden brown. Add half of the soy sauce to the tempeh cubes after 2 minutes of cooking.
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Mix the peanut butter, the remaining soy sauce, the remaining garlic and honey with the water.
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Serve the noodles with the stir-fried sweet potato, bok choy and tempeh on a (deep) plate. Season with salt and pepper. Drizzle the peanut sauce over the dish or serve it on the side.
Those seven minutes of sweet potato in the wok are doing more than softening the cubes. Research shows that cooking sweet potato with fat increases the body’s access to beta-carotene — the orange compound it converts to vitamin A — by 10 to 20 times compared to cooking without oil. The olive oil coating every cube during stir-frying is the medium that makes that absorption possible.
Tempeh is fermented with Rhizopus mold, which produces enzymes called phytases during the process. Phytases break down phytic acid — the primary antinutrient in soybeans that binds iron, zinc, and calcium, making them harder for the body to absorb. A 2026 scoping review in npj Science of Food (Nature) analyzed 36 studies and rated this phytase pathway’s consistency across different legumes as high. In vitro digestion models show minerals become significantly more soluble after fermentation. Animal studies found improved hemoglobin regeneration — a marker of iron absorption — from fermented legumes compared to unfermented ones. The review noted a gap: human isotope-tracer studies have not yet been done specifically for tempeh, so the exact absorption increase in humans remains unmeasured.
Tempeh fermentation and mineral bioavailability · DOIWhy This Works
Behind this recipe
Does cooking tempeh reduce the fermentation benefits?
No. The phytase enzymes do their work during fermentation, not during cooking. By the time tempeh reaches the store shelf, those enzymes have already broken down most of the phytic acid in the soybeans. Pan-frying the cubes changes the texture and flavor, but the phytate reduction that happened during fermentation is already locked in.
Is 38 grams enough protein from a plant-based meal?
For most adults, a single meal delivering 38 grams of protein falls well within the range researchers associate with effective muscle protein synthesis per sitting. Tempeh protein comes from soybeans, which provide all essential amino acids — one of the few plant sources that does.
Can I use regular noodles instead of whole wheat?
Yes. The recipe works with any noodle. Whole wheat noodles contribute non-heme iron to the bowl, which pairs with the soy sauce’s iron-absorption-enhancing properties. Switching to regular noodles removes that specific mineral interaction, but the recipe’s other mechanisms — tempeh’s reduced phytate and bok choy’s bioavailable calcium — still apply.
Why is soy sauce listed separately from the peanut sauce?
Half the soy sauce goes into the pan with the tempeh during frying — it caramelizes on the cubes and adds a savory crust. The other half gets mixed into the peanut sauce. Splitting it serves two purposes: flavor layering in the tempeh, and binding the sauce.
