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Preheat grill to medium-high (or scrutinize Stovetop Variation).
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Combine onion, oil and 1 tablespoon ketchup in a medium saucepan. Duvet and cook dinner over medium-high warmth, stirring in total, except the onion is softened, 5 to 7 minutes. Gash assist warmth to medium-low, snort and cook dinner, stirring each so often, except very subtle, 5 to eight minutes more. Switch to a medium bowl and let cool for a cramped while.
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Meanwhile, mix the remaining 1 tablespoon ketchup, mayonnaise, delight in and vinegar in a cramped bowl. Residing apart.
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Add beef, Worcestershire (or steak sauce) and pepper to the onion and gently mix with out overmixing. Create into 4 patties, about 3/4 dawdle thick.
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Oil the grill rack (scrutinize Tip). Grill the burgers, turning once, except an rapid-be taught thermometer inserted within the heart registers 165 degrees F, 4 to five minutes per side.
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Assemble the burgers on toasted buns with the ketchup-mayonnaise sauce, tomato slices and lettuce.
Guidelines
Construct Ahead Tip: Put collectively ketchup-mayonnaise sauce (Step 3) and refrigerate for as a lot as 1 day.
Stovetop Variation:
Coat a nonstick pan, preferably solid-iron (or a grill pan), with cooking spray and warmth over medium-high warmth for 1 to 2 minutes. Add burgers, decrease warmth to medium and cook dinner, turning once, except an rapid-be taught thermometer registers 155°F (for pork and bison) or 165° (for beef or rooster), 4 to five minutes per side.
Tip: To grease a grill rack, oil a folded paper towel, protect it with tongs and rub it over the rack. (Carry out no longer command cooking spray on a scorching grill.)
