For the ketchup: Combine the ketchup with the allspice, cayenne, chile flakes, garlic powder, onion powder, sugar, thyme and lime juice.
For the onion rings: Preheat a deep fryer with canola oil to 375 degrees F. Combine the flour with some beer until the batter is the consistency of pancake batter, a quarter to half of the bottle. Slice the onion into 1/2-inch rings, then separate the individual rings. Add the onions into the wet mixture. Fry until golden brown, 3 to 5 minutes. Drain the onion rings and immediately sprinkle with some salt and pepper.
For the burger: Preheat a grill to medium-high heat. Combine the beef with the allspice, cayenne, chile flakes, garlic powder, onion powder, sugar and thyme. Form the beef into 2 to 4 patties then press the center of each with your thumb to create an indent. Drizzle the patties with olive oil. Sprinkle each side with salt and pepper. Cook until the center is medium pink, 5 to 8 minutes per side.
Assemble the burgers on the buns topped with the jerk ketchup and serve with the onion rings.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.