Grilled Mediterranean Portobello Mushroom Sandwich

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

A flavorful grilled Portobello sandwich layered with Mediterranean ingredients for a satisfying vegetarian meal. This mediterranean-inspired vegetarian ready in about 37 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 350 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: 25 min Cook: 12 min Serves 4 Mediterranean cuisine 350 cal/serving
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Ingredients

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Instructions

  1. Step 1: In a shallow dish, whisk together 3 tablespoons olive oil, 2 tablespoons balsamic vinegar, 2 minced garlic cloves, 1 teaspoon dried oregano, 1 teaspoon salt, and 1/2 teaspoon black pepper. Add 4 large Portobello mushroom caps and marinate for 20 minutes, turning occasionally.
  2. Step 2: Preheat grill or grill pan to medium-high heat. Grill the mushrooms for 5-6 minutes per side until tender and grill marks appear.
  3. Step 3: Spread 1 tablespoon tzatziki sauce on the bottom half of each toasted ciabatta roll (4 rolls). Layer each with grilled Portobello cap, 2 tablespoons crumbled feta cheese, 2 tablespoons sliced roasted red peppers, and 1/4 cup fresh baby spinach.
  4. Step 4: Top with the other half of the roll and serve immediately while warm and juicy.

Frequently asked questions

How long does Grilled Mediterranean Portobello Mushroom Sandwich take to make?

Total time is about 37 minutes (25 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 Mediterranean Portobello Mushroom Sandwich?

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 Mediterranean Portobello Mushroom Sandwich?

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 Mediterranean Portobello Mushroom Sandwich 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 Mediterranean Portobello Mushroom Sandwich 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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