Red, White & Blue Smash Burgers

Preheat grill to 450°F using a cast iron plate. Portion meat into 8 4-oz. balls. Season each ball of meat with salt and pepper. Lightly glaze the cast iron with canola oil. Place piles of shaved onions on the cast iron and cook for 3-4 minutes. Place a ball of meat on each onion pile and smash down with flat spatula until 1/4'’ thick. Grill for 3-4 minutes, then flip. Continue to grill until meat is 155°F. Add blue cheese crumbles. Continue to grill until meat’s internal temperature reaches 160°F and cheese is melted. Remove from grill and serve on toasted buns dressed with lettuce, mayo & tomatoes.