Lean Beef Burgers (Low-Carb & Paleo)

In a bowl, gently combine the ground beef, grated onion, garlic powder, smoked paprika, salt, and pepper. Handle the meat as little as possible. 2. Form into 4 patties slightly wider than you want them finished, and press a shallow dimple into the center of each so they stay flat on the grill. 3. Heat the grill to medium-high and oil the grates. 4. Grill the patties 4-5 minutes per side, flipping once, until cooked through to 160F. Lean beef dries out fast, so pull them as soon as they hit temperature. 5. Rest 3 minutes, then serve each patty in a butter lettuce cup with tomato, red onion, avocado, and mustard.