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1
In a mixing bowl, combine the onions with the water, cover with plastic wrap and refrigerate overnight.
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2
When ready to make the sliders, drain any excess water from the onions and set aside.
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3
In another mixing bowl, combine the ground chuck and the ground beef. Don't over-mix. Lay out a sheet of plastic wrap. Dump the meat onto it and cover with another sheet. Using a rolling pin, roll very thinly (about 1/4 inch thick) into a large rectangle.
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4
Trim any excess from the rectangle and reroll into a smaller rectangle. Using a pizza cutter, cut 3x3 inch patties out of both rectangles. Season well with salt and pepper.
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5
Using the bottom of a fork or spoon, twirl 5 small holes in each patty (like the pips of the five on a six sided die).
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6
In a large skillet, melt the butter. Add the onions and season well with salt. Saute the onions in the butter for 3 minutes. Spread the onions thinly across the bottom of the skillet. Place each square patty seasoning side down onto the bed of the onions. Cover and steam the patties for 4 minutes.
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7
Wrap the buns in wet paper towels and microwave for 20 seconds. To serve, split the dinner rolls horizontally across the middle and place a patty with a tablespoon of onion on lower half of a dinner roll. Top with one dill pickle slice and then top with upper half of dinner roll. Serve immediately with choice of condiments.
