White Castle Cheeseburger Slyders Copycat

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My homestyle" copycat white castle cheeseburger 'slyders' are prepared differently than in the restaurant... But are just as good."

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Steps

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Finely mince one medium onion by hand , or by pulsing in a food processor.

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Place onions into a heavy-bottomed non-stick or stainless steel skillet.

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Add 2 tablespoons water and 3 / 8 teaspoon kosher salt.

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Cook onions over medium heat until onions are translucent and most water has evaporated.

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Spread onions evenly and levelly in a 15 x 12 baking sheet.

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Loosely cover.

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Place sheet of onions into freezer until almost frozen , adhering to bottom of baking sheet.

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Start with a clean oven.

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Place oven rack in the lower 1 / 3 position.

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Preheat oven to 500f.

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In a medium bowl , mix 3 / 4 lb ground beef with 1 1 / 2 tablespoons water , 3 / 8 teaspoon salt and 1 / 8 teaspoon ground black pepper in a medium bowl with a fork until thoroughly combined.

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Dump ground beef mixture onto a cover ground beef mixture with a sheet of waxed paper.

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Press ground beef mixture into the baking sheet with onions evenly to the edges using hands first , then with a rolling pin if desired , for uniformity.

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Ingredients

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onion, water, salt, 80% lean ground beef, ground black pepper, american cheese, hamburger dills, dinner rolls, prepared yellow mustard, tomato ketchup