Slow-Simmered Kombu Dashi with Fresh Tofu

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A true Japanese broth that embodies the essence of umami, simmered gently to extract delicate flavors without bitterness. Served with silken tofu for a pure, restorative experience. This japanese-inspired soups ready in about 35 minutes pairs kombu (dried kelp), water, silken tofu for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 110 calories and feeds 2, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 20 min Serves 2 Japanese cuisine 110 cal/serving
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Ingredients

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Instructions

  1. Step 1: Place 10g kombu in a cold 1L pot of water, ensuring it's fully submerged. Set heat to low and let the water warm slowly for 15 minutes until it reaches 50°C (122°F) — do not boil, as this creates a bitter taste.
  2. Step 2: Gently remove kombu just before the water reaches a simmer (around 80°C/176°F) and discard it. Return the pot to low heat and add 200g silken tofu, cut into 1-inch cubes, and simmer for 3 minutes until tofu edges soften slightly.
  3. Step 3: Stir in 1 tbsp soy sauce and cook for 2 more minutes until the broth becomes fragrant and the tofu absorbs the umami. Thinly slice 2 green onions and sprinkle over the top just before serving.

Frequently asked questions

How long does Slow-Simmered Kombu Dashi with Fresh Tofu take to make?

Total time is about 35 minutes (15 min prep + 20 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Slow-Simmered Kombu Dashi with Fresh Tofu?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep kombu (dried kelp) from drying out.

Can I substitute ingredients in Slow-Simmered Kombu Dashi with Fresh Tofu?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Slow-Simmered Kombu Dashi with Fresh Tofu for a different number of people?

The recipe is written for 2 servings. Multiply each ingredient by (your serving target / 2). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Slow-Simmered Kombu Dashi with Fresh Tofu?

Japanese soups like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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