Cast-Iron Burgers

Ingredients

• 2 slices applewood-smoked bacon chopped
• 0.3 teaspoon pepper black freshly ground
• 1 tablespoon chives finely chopped
• 1 tablespoon dijon mustard 
• 1 pound ground sirloin 
• 1 tablespoon horseradish prepared
• 2 teaspoons catsup 
• 0.5 teaspoon kosher salt 
• 1 cup lettuce shredded
• 1 tablespoon canola mayonnaise 
• 6 ounce kaiser rolls 
• 4 slices tomatoes (1/4-inch-thick)
• 1 teaspoon worcestershire sauce 
• 3 cups onion yellow vertically sliced

Equipment

• bowl
• frying pan
• slotted spoon

Directions

1. To prepare the patties, divide beef into 4 portions, lightly shaping each into a 1/2-inch-thick patty.
2. Sprinkle evenly with salt. Cover and refrigerate 30 minutes.
3. To prepare horseradish spread, combine mayonnaise and next 3 ingredients (through ketchup) in a small bowl. Set aside.
4. To prepare relish, cook bacon in a large nonstick skillet over medium-low heat until crisp.
5. Remove bacon from pan with a slotted spoon.
6. Add onion to drippings in pan; cook 15 minutes or until golden brown.
7. Combine bacon, onion mixture, chives, Worcestershire sauce, and pepper in a small bowl.
8. Heat a large cast-iron skillet over medium-high heat. Coat pan with cooking spray.
9. Add patties; cook 2 minutes on each side or until desired degree of doneness.
10. Spread 1 1/2 teaspoons horseradish spread on cut sides of each bun half. Top bottom half of each bun with 1 patty, 1/4 cup relish, 1 tomato slice, 1/4 cup lettuce, and top half of bun.