Beef and Ground Pork Sliders

Ingredients

• 1 teaspoon pepper black
• 2 ounces butter 
• 12 slices cheese Gruyere, baby Swiss, or Gloucester
• 12 ounces ground beef 
• 12 ounces ground pork 
• 2 teaspoons kosher salt divided
• 1 teaspoon juice of lemon 
• 0.3 cup equal parts mayonnaise and mustard 
• 1 cup thinly romaine hearts shredded
• 12  petit buns toasted
• 1 teaspoon pepper white
• 1 cup onions yellow thinly sliced

Equipment

• bowl
• frying pan
• grill

Directions

1. In a saute pan over high heat, add the butter, onions, white pepper and 1 teaspoon salt, and cook over high heat until the butter has melted. Reduce the heat to medium and finish cooking the onions until slightly browned on the edges, 7 to 8 minutes.
2. Mix the beef, pork, remaining 1 teaspoon salt, and black pepper in a bowl. Do not over mix or the burger will be too tightly bound. Portion the meat into 12 (2-ounce) balls, then flatten the balls into patties about 2 1/2 inches round.
3. Preheat a grill and grill the burgers for 4 to 5 minutes on each side, or until the internal temperature reaches 160 degrees F.
4. Combine the mayonnaise-mustard mixture with the lemon juice and shredded romaine. Top the bottom bun with the dressed lettuce, a burger, some caramelized onions, and cheese of choice.
5. Add the top bun and serve.