Steak-House Sliders with Mushrooms and Blue Cheese

Ingredients

• 1 lb. ground beef sirloin
• 1/2 lb. ground beef chuck
• 2 tsp. Dijon mustard
• 2 tsp. Worcestershire sauce
• 1 tsp. chopped thyme leaves
• 1 1/2 tsp. garlic paste
• 1/2 tsp. kosher salt
• 1/2 tsp. Freshly ground black pepper
• 2 tbsp. butter
• 1 large onion
• 1 package sliced fresh cremini mushrooms
• c. dry white wine
• 8 Slider buns
• 3 tbsp. creamy mustard spread (such as Dijonnaise)
• 1 c. baby arugula
• 3 oz. creamy blue cheese or Gorgonzola cheese

Instructions

1. In a large bowl, gently combine ground sirloin, ground chuck, mustard, Worcestershire sauce, thyme, 1/2 tsp of the garlic paste (or 1/4 tsp of the fresh garlic), salt, and pepper. Form into eight 2 1/2-inch-diameter patties of equal thickness; refrigerate.
2. Melt butter in a large skillet over medium high heat. Add onions and sauté for 4 minutes or until translucent. Add mushrooms and sauté for 4 more minutes. Stir in remaining garlic. Deglaze skillet with wine; let wine cook down until almost evaporated. Remove pan from heat and keep it warm.
3. Prepare an outdoor grill with a medium-hot fire (or heat a stovetop grill pan over medium heat). Toast buns on grill 1 to 2 minutes, until lightly toasted. Grill sliders 2 to 3 minutes per side for medium-rare doneness.
4. Spread bun bottoms with Dijonnaise, then top with arugula and sliders. Spoon the mushroom mixture over each slider and top with blue cheese and bun tops.