Asian Pork Burgers

1 1/2 lb fresh ground pork
1/2 cup ketchup
3 cloves garlic, minced
2 tablespoons soy sauce
3 tablespoons sriracha or asian chili garlic sauce
1 medium sweet onion
4 burger buns
1 teaspoon canola oil

-Mix together the ketchup & 1 tablespoon of sriracha and set aside
-Gently mix together the pork, soy sauce, garlic, and remaining sriracha. Form the mixture into four 1/2 inch thick patties
-Cut the onion into 1/4 inch slices & rub the cut side of the onion with the oil
-Preheat the grill to medium high heat. Grill the onions & burgers until the onions are tender and the burgers are cooked through, 4-6 minutes per side
-Serve the burgers on toasted buns with the ketchup mixture, lettuce, and onion