Portobello Burgers with Blue Cheese and Sautéed Red Onions

Ingredients

• 8 large portobello mushroom caps
• 4 cloves garlic, minced
• 3 tbsp. steak sauce (such as A1)
• 3⁄4 cup breadcrumbs
• 1 egg
• 1⁄2 tsp. fresh-ground black pepper
• 2 tbsp. olive oil
• 4 oz. blue cheese, crumbled, for serving
• 4 sesame seeded hamburger buns, split and toasted, for serving

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