Goulash

Name: Goulash
Ingredients: 6 medium onions, peeled and thinly sliced; 4 tablespoons butter; 2 tablespoons oil; ¼ cup Hungarian paprika; ¼ cup wine vinegar; 3 pounds rump or chuck, cut into 2-inch cubes; Salt and freshly ground pepper; 1 teaspoon thyme; 2 tablespoons tomato paste; 2 cloves garlic, chopped; 3 to 4 tablespoons flour; Beef broth, about 2 cups; Zest of 1 lemon; 1 tablespoon caraway seeds