Oklahoma Fried Onion Burger

Things needed:

1 big onion, peeled and cut in half; thinly slice.
Add salt and pepper.
1 lb. of lean beef
30 milliliters of butter
1 teaspoon of non-stick cooking spray
Four or eight slices of American cheese
Pickles, mayonnaise, and mustard for garnishing
4 toasted hamburger buns
Fried Onion Burger Recipe from Oklahoma:

An onion and a teaspoon of salt, finely sliced, should be mixed together in a basin. Before sitting for 30 minutes (shaking periodically), transfer the seasoned onions to a colander.
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