Buckwheat Kasha with Mushrooms and Caramelized Onions

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

Nutty buckwheat groats cooked and tossed with sautéed mushrooms and sweet caramelized onions for a hearty side or vegetarian main. This russian-inspired vegetarian (vegetarian) ready in about 40 minutes pairs buckwheat groats, water, divided olive oil for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 280 calories and feeds 4, 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: 10 min Cook: 30 min Serves 4 Russian cuisine 280 cal/serving
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Ingredients

Instructions

  1. Step 1: Rinse 1 cup buckwheat groats under cold water until water runs clear. In a medium saucepan, bring 2 1/2 cups water to a boil. Add buckwheat and 1/2 tsp salt, reduce heat to low, cover and simmer for 15 minutes until water is absorbed and groats are tender. Remove from heat and let sit covered for 5 minutes.
  2. Step 2: While buckwheat cooks, heat 2 tbsp olive oil in a large skillet over medium heat. Add 2 medium thinly sliced yellow onions and cook, stirring occasionally, for 12-15 minutes until deep golden and caramelized.
  3. Step 3: Add 8 oz sliced white mushrooms to the skillet with onions and cook for an additional 5-6 minutes until mushrooms release moisture and become browned.
  4. Step 4: Stir in 2 minced garlic cloves, 1/2 tsp black pepper, and 1/2 tsp salt. Cook for 1 more minute until fragrant.
  5. Step 5: Fluff cooked buckwheat with a fork and transfer to the skillet with mushroom and onion mixture. Drizzle with remaining 1 tbsp olive oil and toss gently to combine and warm through.
  6. Step 6: Garnish with 2 tbsp chopped fresh parsley and serve as a side or vegetarian main dish.

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Frequently asked questions

How long does Buckwheat Kasha with Mushrooms and Caramelized Onions take to make?

Total time is about 40 minutes (10 min prep + 30 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 Buckwheat Kasha with Mushrooms and Caramelized Onions?

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 buckwheat groats from drying out.

Can I substitute ingredients in Buckwheat Kasha with Mushrooms and Caramelized Onions?

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 Buckwheat Kasha with Mushrooms and Caramelized Onions for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). 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.

Is Buckwheat Kasha with Mushrooms and Caramelized Onions vegetarian?

Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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