03Peel onions and trim root ends slightly, leaving onions whole, then halve lengthwise and cut halves lengthwise into 1/2-inch-thick wedges. Insert 1 wooden pick through each wedge to hold layers together while grilling, then put onions in a bowl.
04Heat vinegar, sugar, and salt in a small nonreactive heavy saucepan over moderate heat, stirring, until sugar is dissolved. Pour pickling liquid over onions, stirring occasionally to coat with liquid, and let stand 5 minutes (onions will brighten in color), then drain onions and pat dry.
05Prepare grill for cooking. If using a charcoal grill, open vents on bottom of grill, then light charcoal. Charcoal fire is medium-hot when you can hold your hand 5 inches above rack for 3 to 4 seconds. If using a gas grill, preheat burners on high, covered, 10 minutes, then reduce heat to moderate. Grill onions on a lightly oiled grill rack, covered only if using a gas grill, turning over once, until tender, about 5 minutes total. Remove and discard wooden picks.
06Sprinkle salt and pepper on both sides of burgers, then grill burgers on lightly oiled grill rack, covered only if using a gas grill, turning over once with a spatula, 5 to 6 minutes total for medium-rare. Meanwhile, grill English muffins, turning over once with tongs, until toasted, about 3 minutes total. Serve burgers on muffins topped with sauce and onions.
Data quality
servings.value—
times.totalMinutes✓
nutrition.calories—
recipeCuisine—
recipeCategory—
rating✓
description✓
image (URL only)✓
Not rich — missing servings, total time, or calories.