Rinse Fillets
Dredge fillets in flour and shake off excess.
In a hot skillet with some vegetable oil, pan braise fillets, three minutes on each side, until done when tested.
Place on an ovenproof platter, and place in a warm oven. (250 degrees Farenheight)
In one tablespoon oil, sauté onions until lightly browned, about 10 minutes.
Add vinegar and continue cooking for one minute more.
Spoon onion mixture over fillets and let sit in the oven for 5 minutes.
Serve warm.