Grilled Vegetarian Portobello Mushroom Steaks with Balsamic Glaze

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

Meaty Portobello mushroom caps marinated and grilled until tender, topped with a rich balsamic reduction for a satisfying vegetarian main. This mediterranean-inspired vegetarian (vegetarian) ready in about 47 minutes pairs large Portobello mushroom caps, olive oil, balsamic vinegar for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 140 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: 35 min Cook: 12 min Serves 4 Mediterranean cuisine 140 cal/serving
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Ingredients

Instructions

  1. Step 1: In a shallow dish, whisk together 1/4 cup olive oil, 1/4 cup balsamic vinegar, 2 tbsp soy sauce, 3 minced garlic cloves, 1 tsp dried thyme, 1/2 tsp black pepper, and 1 tbsp honey to create marinade and glaze.
  2. Step 2: Clean 4 large Portobello mushroom caps by removing stems and wiping with a damp cloth. Place mushrooms in marinade, flipping to coat both sides, and let sit for 30 minutes.
  3. Step 3: Preheat grill to medium-high heat (around 400°F). Remove mushrooms from marinade, reserving the liquid.
  4. Step 4: Grill mushrooms for 5-6 minutes per side until tender and grill marks appear, brushing occasionally with reserved marinade to build a glaze.
  5. Step 5: Transfer mushrooms to plates, drizzle with any remaining glaze, and sprinkle with 2 tbsp chopped fresh parsley before serving.

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Frequently asked questions

How long does Grilled Vegetarian Portobello Mushroom Steaks with Balsamic Glaze take to make?

Total time is about 47 minutes (35 min prep + 12 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 Grilled Vegetarian Portobello Mushroom Steaks with Balsamic Glaze?

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 olive oil from drying out.

Can I substitute ingredients in Grilled Vegetarian Portobello Mushroom Steaks with Balsamic Glaze?

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 Grilled Vegetarian Portobello Mushroom Steaks with Balsamic Glaze 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 Grilled Vegetarian Portobello Mushroom Steaks with Balsamic Glaze 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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