Prep Time::20 mins
Cook Time::40 mins
Total Time:: 1 hr
Servings::4
Yield::4 burgers
Ingredients
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1/2 cup mayonnaise
1 1/2 tablespoons ketchup
1 tablespoon pickle relish
1 teaspoon sugar
3/4 teaspoon white vinegar
1 tablespoon butter
1 tablespoon canola oil
3 cups fineley chopped yellow onions
3/4 teaspoons salt, divided
4 tablespoons water, or as needed
1 lb ground chuck or 80% lean ground beef
1 teaspoon canola oil
1/2 teaspoon black pepper
3 tablespoons mustard
8 slices American cheese
4 hamburger buns, toasted
16 dill pickle chips
4 slices tomato
2 leaves iceberg lettuce, torn
Directions
Stir together mayonnaise, ketchup, relish, sugar, andvinegar in a small bowl for the sauce.
Heat butter and 1 tablespoon oil in a nonstick skilletover medium heat. Add onions and season with ¼ teaspoon salt. Cook, stirring occasionally, until onions are tender and golden brown, about 20 minutes. When skillet starts to become dry, add 1 tablespoon water. Continue cooking, stirring often, adding more water as needed, 1 tablespoon at a time, until onions are very soft, deeply browned, and jammy, 10 to 15 minutes more. You may not need to use all the water. Remove from heat.
Shape beef into 8 patties, about 3/8-inch-thick and 4inches in diameter. Sprinkle with pepper and remaining 1/2 teaspoon salt.
Heat 1 teaspoon oil in a large cast-iron skillet overmedium-high heat. Working in batches as needed, add patties to skillet. Spread 2 teaspoons mustard over top of each patty. Cook until browned, about 2 minutes per side. Top patties with cheese and onions. Cook, covered, about 30 seconds, until cheese is melted. An instant-read thermometer inserted into the center should read at least 160 degrees F (70 degrees C). Layer patties to create 4 stacks.
Spread sauce onto bun bottoms. Fill each bun with 4 pickles, a tomato slice, lettuce, and 1 patty stack.