Macerating red onions in balsamic vinegar with a big pinch of sugar helps soften the onions and sweetens them right up.
Recipe information
Yield
8 servings
Ingredients
Preparation
Step 1
Divide meat into 8 portions (about 4 oz. each). Place 1 portion on a work surface. Cup your hands around the meat and shape it into a rounded mound. Gently flatten patty to about 3/4" thick. Season both sides with salt and pepper. Repeat with remaining portions of meat.
Step 2
Prepare a grill for medium-high heat. Grill patties until lightly charred on bottom, about 3 minutes. Flip and top with a piece of cheese. Grill to desired doneness (cheese should be melted), about 3 minutes for medium-rare. Transfer patties to a cutting board and let rest 5 minutes.
Step 3
While patties are resting, grill the buns, cut side down, until lightly charred around the edges, about 30 seconds.
Step 4
Toss onion with vinegar, sugar, and a pinch of salt in a medium bowl and let sit, squeezing onions occasionally to soften slightly, 5 minutes.
Step 5
Build sliders with patties, buns, onions, and aioli.
Do Ahead
Step 6
Patties can be formed 6 hours ahead. Cover and chill.
Recipe notes
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