Instructions

  1. Preheat grill to medium-high.
  2. Combine Cheddar and Mozzarella (or Gruyère) in a small bowl.
  3. Gently mix beef, Worcestershire, paprika, ground pepper and Montreal steak spices in a large bowl, preferably with your hands, without overworking.
  4. Shape into 8 thin, 4-inch-wide patties.
  5. Mound 2 tablespoons of the cheese mixture on each of the 4 patties, leaving a 1/2 inch border.
  6. Cover each with one of the remaining patties. Crimp and seal the edges closed.
  7. To grill: lightly oil the grill rack. Grill the stuffed patties over medium-high heat, about 4 minutes per side for medium-well (be sure not to press the burgers as they cook or they'll split open and the cheese will ooze out).