Lightly combine all ingredients, seasoning with salt and pepper.

Gently form into sixteen 3/4 inch (2 cm)-thick patties. Place patties in a single layer onto several plastic wrap-lined baking trays; cover loosely with plastic wrap and freeze just until meat is firm (1 to 2 hours). Wrap patties tightly in heavy foil or place them into freezer bags and freeze for up to 3 months.

Thaw in refrigerator overnight to cook or cook from frozen. To cook frozen patties: place on greased grill over medium-high heat; close lid and cook, turning twice, until digital instant read thermometer inserted sideways into centre of each patty reads 160°F (71°C), about 10 minutes.