Bobby Flay’s Barbecue Sauce

Heat the oil in a saucepan over medium-high heat until warm and shimmering. Add the onion and cook until softened, 3 to 4 minutes. Add the garlic and cook for 1 minute. Add the ketchup and water and bring to a boil, stirring frequently. Reduce the heat to medium-low and simmer for 5 minutes.