Mix Lodo Red Adobo thoroughly into ketchup and set aside. Start grill. Mix together ground beef, pepper, salt, garlic, oregano, cumin and egg (if needed to bind) until thoroughly combined, but not overworked. Form into 4 equal sized balls. Flatten out each ball to 1/4" thick and place a tbsp each of the diced red onion and diced cheddar in the middle. Fold flatten burger meat over the onion and cheddar enclosing it securely in the middle of the meat and form back into a ball. Then flatten into a 3/4" thick burger patty. Grill to desired temperature, turning only once. Toast bun on the grill in indirect heat.
Serve with Maple Pepper Sweet Potato Wedges.