Japanese Udon With Mushroom Broth: A Heart-Healthy Bowl Worth Making

There is a reason Japanese cuisine has one of the longest associations with cardiovascular health in population research. The emphasis on plant-based ingredients, umami-rich broths built from vegetables and mushrooms rather than meat, and minimal use of saturated fat maps closely onto the principles the DASH eating plan recommends for blood pressure management. This udon bowl is a good example of that approach in practice.

The broth here is built entirely from dried mushrooms, kombu, scallions, and aromatics. No meat, no cream, no saturated fat. The dried mushrooms do the heavy lifting, producing a broth with extraordinary depth of flavor that genuinely does not need anything added to it. The only modification from the classic preparation is a swap to low-sodium soy sauce, which brings the sodium content into DASH-compatible territory without changing the flavor profile.

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Why These Ingredients Support Heart Health

Mushrooms

Mushrooms are one of the most nutritionally underappreciated ingredients in a heart-healthy kitchen. A comprehensive review published in Advances in Nutrition found that mushrooms provide meaningful amounts of potassium, fiber, B vitamins, and ergothioneine, a unique antioxidant compound that the body concentrates in cardiovascular tissue. Shiitake mushrooms specifically contain beta-glucans, the same class of soluble fiber documented in oats that supports healthy cholesterol levels. The combination of dried and fresh mushrooms in this recipe maximizes the cardiovascular benefit while building the broth.

Napa Cabbage

Napa cabbage is one of the most potassium-dense vegetables available relative to its caloric content. It also provides vitamin K, vitamin C, and fiber in a very low-sodium package. Potassium directly counteracts sodium’s blood pressure raising effects by helping the kidneys excrete excess sodium. Adding cabbage as a topping rather than a broth component preserves its texture and keeps a meaningful portion of its nutrients intact.

Garlic

Two cloves of smashed garlic go into the broth base. Garlic has one of the most consistently documented cardiovascular profiles of any kitchen ingredient, including allicin production and mild ACE-inhibitory activity. For more on garlic’s cardiovascular role, see our Garlic Rosemary Mushrooms recipe, which covers the evidence in detail.

Kombu

Kombu is dried sea kelp and the source of the natural glutamates that give Japanese broth its characteristic savory depth. It provides iodine, which supports thyroid function, alongside a small amount of potassium and magnesium. One note: people with thyroid conditions or those on thyroid medication should be aware of kombu’s iodine content and check with their physician if using it regularly in therapeutic quantities. In a broth where it is steeped and removed, the iodine contribution per serving is modest.

A Note on Soy Sauce

Standard soy sauce contains approximately 900 to 1,000 milligrams of sodium per tablespoon. Two tablespoons would provide close to the entire DASH lower daily limit of 1,500 milligrams from a single seasoning. This recipe uses low-sodium soy sauce or tamari instead, which typically contains 700 milligrams per two tablespoons across the whole recipe. That is a meaningful reduction. The American Heart Association recommends treating soy sauce as a high-sodium condiment and using reduced-sodium versions wherever possible. The flavor difference is negligible.

Ingredients

Makes 2 servings

For the Broth

• 1/2 oz dried wood-ear mushrooms (available at most Asian grocers; substitute porcini, chanterelle, or shiitake if unavailable)
• 1/2 oz dried morel mushrooms (available at specialty grocers; substitute any dried mushroom)
• 4 oz mixed fresh mushrooms (shiitake, shimeji, oyster, and enoki all work well), trimmed, stems and scraps reserved for broth
• 8 scallions, divided
• 2 cloves garlic, smashed
• 1 small yellow onion, skin on, halved
• 1 piece kombu (approximately 4 inches), available at Asian grocers
• 2 tbsp low-sodium soy sauce or tamari — see note above
• 2 tbsp mirin (sweet Japanese rice wine; available at Asian grocers)
• A small pinch of salt, if needed — taste before adding given sodium already in the broth

For the Bowl

• 2 tbsp vegetable oil, divided
• 1 cup napa cabbage, cut into 3/4-inch strips
• 2 servings fresh or dried udon noodles — check the label and choose a lower-sodium variety, or substitute soba noodles for a whole-grain buckwheat option
• 2 to 4 pieces fried tofu (available packaged in the refrigerated section of most Asian grocers)

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Directions

Make the broth

• Combine the dried wood-ear and morel mushrooms in a medium saucepan and cover with 1.5 quarts of water. Bring to a boil over high heat, then remove from heat and let rest for 10 minutes while the mushrooms rehydrate. Remove the mushrooms with a slotted spoon and set them aside.
• Add the fresh mushroom scraps and stems, the bottom inch of the scallions, garlic, onion, and kombu to the pot. Bring to a boil, then reduce to a gentle simmer. Cook for 20 minutes.
• While the broth simmers, remove the tough central stems from the wood-ear mushrooms and discard. Slice the wood-ears and morels into strips and transfer to a small bowl. Slice the fresh mushrooms and add them to the bowl. If using enoki, set them aside separately as they will be added raw at the end.
• When the broth is done, strain through a fine mesh strainer and return the liquid to the pot, discarding all solids. Add the low-sodium soy sauce and mirin. Taste and add a small pinch of salt only if needed. You should have about 1 quart of broth. Keep warm over low heat.

Finish the bowl

• Heat 1 tablespoon of vegetable oil in a wok or large skillet over high heat until lightly smoking. Add all the sliced mushrooms except the enoki and stir-fry until lightly browned and tender, about 2 minutes. Transfer to a plate.
• Add the remaining tablespoon of oil to the wok and heat until smoking. Add the napa cabbage and stir-fry until tender with some charred spots, about 2 minutes. Transfer to the plate with the mushrooms.
• Cook the udon noodles in boiling water according to package directions. Add the fried tofu to the water as the noodles cook, just to heat it through. Drain and divide the noodles between two serving bowls.
• Pour the hot broth over the noodles. Top with the stir-fried mushrooms and cabbage, raw enoki if using, fried tofu, and the finely sliced green tops of the remaining scallions. Serve immediately.

Storage: The broth keeps well in the refrigerator for up to 3 days and freezes for up to 2 months. Store the broth separately from the noodles and toppings. Reheat the broth and cook fresh noodles when serving.

Heart-Healthy Eating as Part of a Broader Plan

Recipes like this one deliver real nutritional value — potassium, beta-glucans, plant protein, and a broth rich in umami without the saturated fat of a meat-based stock. For more ideas on whole foods that support healthy blood pressure, see our roundup of natural foods to lower blood pressure.

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