Portobello Steak Burger With Caramelized Onions

Name: Portobello Steak Burger With Caramelized Onions
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 1 cup balsamic vinegar; 2 tablespoons olive oil; 1 teaspoon dried basil; 1/4 teaspoon kosher salt; 1/4 teaspoon ground white pepper; 2 garlic cloves, minced; 6 portobello mushroom caps (about 1 1/2 pounds); Cooking spray; 1 tablespoon olive oil; 1 1/2 cups sliced onion; 1/4 cup low-fat mayonnaise; 1 teaspoon bottled minced roasted garlic; 6 (2-ounce) whole-wheat Kaiser rolls or hamburger buns; 6 curly leaf lettuce leaves; 6 large (1/4-inch-thick) slices tomato

Servings: persons

1 cup balsamic vinegar
2 tablespoons olive oil
1 teaspoon dried basil
1/4 teaspoon kosher salt
1/4 teaspoon ground white pepper
2 garlic cloves, minced
6 portobello mushroom caps (about 1 1/2 pounds)
Cooking spray
1 tablespoon olive oil
1 1/2 cups sliced onion
1/4 cup low-fat mayonnaise
1 teaspoon bottled minced roasted garlic
6 (2-ounce) whole-wheat Kaiser rolls or hamburger buns
6 curly leaf lettuce leaves
6 large (1/4-inch-thick) slices tomato

1
Combine first 6 ingredients in a large zip-top plastic bag. Add mushroom caps; seal and marinate in refrigerator 24 hours.
2
Prepare grill or broiler.
3
Remove mushroom caps from bag, discarding marinade. Place mushroom caps on grill rack or broiler pan coated with cooking spray; cook 5 minutes or until tender.
4
Heat the oil in a medium nonstick skillet over medium-high heat. Add onion; cover and cook 10 minutes or until golden brown, stirring frequently.
5
Combine mayonnaise and roasted garlic in a small bowl. Spread 1/2 tablespoon mayonnaise mixture evenly over the top halves of buns; top each bottom half of bun with 1 lettuce leaf, 1 tomato slice, 1 mushroom cap, 1 tablespoon caramelized onion, and top half of bun.

652

kcal

Calories

Fat

Carbs

Protein

Fat Carbs Protein

* Per serving · 4 servings · Values may vary.

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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How did you like this recipe?

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

You need 15 ingredients. The key ingredients include: 1 cup balsamic vinegar, 2 tablespoons olive oil, 1 teaspoon dried basil, 1/4 teaspoon kosher salt, and more.

Yes, Portobello Steak Burger With Caramelized Onions falls under the Meat & Poultry category and is a great choice for this type of meal.

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

That's it — enjoy your meal!