Make A Broth By Simmering The Meat In The Water With The Salt, Pepper And The Whole Onion, Until The Meat Is Tender. Then Skim Off The Froth, And Discard The Onion. Remove The Meat With A Slotted Spoon And Drain On Paper Towels. Set Aside. Melt 2 Tablespoons Of The Butter In A Frying Pan. Fry The Meat Over High Heat Until Well Browned, Then Remove To A Serving Bowl And Keep Warm. Fry The Garlic In The Remaining Butter Until Golden Brown. Stir The Contents Of The Frying Pan And The Vinegar Into The Broth; Then Bring To A Boil.