PORTOBELLO BURGERS WITH BLUE CHEESE AND SAUTÉED RED ONIONS

(Via Saveur)

Serves: 4

For the Portobello Burgers

8 large portobello mushroom caps
4 cloves garlic, minced
3 tbsp. steak sauce (such as A1)
34 cup breadcrumbs
1 egg
12 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

For the Onions

3 tbsp. butter
1 large red onion, thinly sliced
2 tbsp. balsamic vinegar
2 tsp. dried thyme
Salt and pepper, to taste

Instructions

Make the portobello burgers: place mushroom caps in a bamboo steamer over simmering water, or over a steamer insert in a 6 quart saucepan. Cover and steam until mushrooms are tender, about 7 minutes. Place cooked mushrooms in a food processor with garlic, steak sauce, bread crumbs, and egg, and season with black pepper. Pulse just until mixture comes together, about 20 pulses or 30 seconds. Divide mixture into four 6 oz. patties, 4-inches wide by 13-inch thick. Place on a plate and refrigerate for 20 minutes or until ready to use. (See note.)
Make the onions: Heat butter in a 12-inch skillet over medium-high heat. Sauté onion until soft, about 8 minutes. Add vinegar, thyme, salt, and pepper and cook until onions are slightly caramelized, about 7 minutes more. Remove from the pan and reserve.
Wipe out skillet and heat olive oil over medium-high. Cook portobello burgers, until toasted on each side and cooked through, about 12 minutes (6 minutes per side). Top each burger with 1 oz. cheese and continue to cook until just melted, about 2 minutes. Divide cheese-topped burgers between toasted buns, top with onions, and serve.
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