How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Grilled Portobello Mushrooms, Sweet Peppers and Red Onions?

You need 10 ingredients. The key ingredients include: 1/4 cup extra virgin olive oil, 1/2 cup balsamic vinegar, 2 tsp. finely minced thyme, 1 tsp. finely grated lemon zest, and more.

Is Grilled Portobello Mushrooms, Sweet Peppers and Red Onions suitable as general?

Yes, Grilled Portobello Mushrooms, Sweet Peppers and Red Onions falls under the General category and is a great choice for this type of meal.

How do I store leftover Grilled Portobello Mushrooms, Sweet Peppers and Red Onions?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Grilled Portobello Mushrooms, Sweet Peppers and Red

Name: Grilled Portobello Mushrooms, Sweet Peppers and Red Onions
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 1/4 cup extra virgin olive oil; 1/2 cup balsamic vinegar; 2 tsp. finely minced thyme; 1 tsp. finely grated lemon zest; 1 1/2 lb. large portobello mushrooms, stemmed; 2 large red bell peppers, halved, stemmed and seeded; 2 large yellow bell peppers, halved, stemmed and seeded; 2 large red onions, peeled and sliced in thick rounds; Salt and freshly ground black pepper to taste; Tender greens such as arugula, peppercress and radish sprouts for garnish

Try this homemade Grilled Portobello Mushrooms, Sweet Peppers and Red Onions recipe the whole family will love. Made with extra virgin olive oil, balsam…

This Grilled Portobello Mushrooms, Sweet Peppers and Red Onions relies on simple, everyday ingredients such as extra virgin olive oil, balsamic vinegar, finely minced thyme and finely grated lemon zest. It comes together quickly and makes 4 servings, at about 229 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 General

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Feel free to swap in similar ingredients you already have on hand and adjust seasoning to taste.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Grilled Portobello Mushrooms, Sweet Peppers and Red Onions

Tips for the best results

Variations & substitutions

My Personal Notes

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