These sliders are served at The Plaza Food Hall located in midtown Manhattan, but this is definitely easy enough to make at home. Perfect for an afternoon get-together served with a few cold brews or some ice-cold lemonade.
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Heat the oil in a deep pot over high heat to 350 degrees. Drop the onions into the pot, frying until golden brown. Remove from the oil, season with salt and pepper, to taste, and let cool on paper towels to remove excess grease and reserve.
Place all ingredients in a mixing bowl and mix thoroughly. Set aside.
Preheat a gas grill over medium-high heat or fire up a charcoal grill and coat with oil.
Season the patties with salt and pepper, to taste, and grill 3 minutes on each side (or longer if you prefer your burger better done). Place ½ slice of the Cheddar on the top of each burger so it melts. Toast the brioche rolls on the grill.
To plate, place the bottom of the burger roll on the plate, add some mustard relish, place the onions on top, and then the patty, followed by the mayonnaise, lettuce, tomato, and ketchup and top with the other half of the bun. Serve immediately.