Ingredients
- 1 large onion, diced
- 1 pound ground beef (80 percent lean)
- 1/2 cup Worcestershire sauce
- 1 tablespoon garlic powder
- 1 tablespoon onion powder
- Salt and pepper
- 3 tablespoons shredded Cheddar
- 3 tablespoons shredded pepper Jack cheese
- Oil, for oiling grill grates
- 4 large portobello mushrooms
- 1 red onion, sliced into thick rings
- 4 hamburger buns, split
- 2 cups mayonnaise
- 1 cup sriracha hot sauce
- Arugula, for topping
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