How to Make the Tastiest and Juiciest Grass-Fed Burger

Combine grass-fed beef, grated onion, cream, and pepper in a large mixing bowl. Do not overwork the beef; mix until combined. Form mixture into six burgers. Prepare grill for indirect medium heat or heat a cast iron skillet on the stove over medium-low-to-medium heat. Brush both sides of burgers with melted butter. Sprinkle with kosher salt. Cook burgers until desired doneness is reached, about 4 to 6 minutes on each side, depending on the thickness of the burgers. Let burgers rest 5 minutes before serving.