Saute chopped onion in the butter until translucent. Set aside.
In a mixing bowl, mix ground beef, water, salt and pepper.
Use a 2 oz. ice cream scoop and make into 12 balls. Heat a grill on the stove to
medium high heat. Lightly spray grill with oil. Wrap the rolls in foil and heat
in the oven, for about 8 minutes.
Place the balls on the grill and mash down gently with a spatula. Cook on one
side, about 3 minutes. Turn and top with a big spoonful of onions. Add a slice
of cheese. Cook for 2 - 3 more minutes.
Slice the warm buns in half and add the beef patties. Top with a pickles.