Paprika Veal Shanks

Name: Paprika Veal Shanks
Ingredients: 2 large onions, chopped (3 cups); 1 pound Cubanelle peppers (Italian green frying peppers; 4 large), coarsely chopped; 3/4 cup vegetable oil, divided; 2 Turkish bay leaves or 1 California; 1 (14- to 15-ounce) can plum tomatoes in juice; 2 tablespoons sweet Hungarian or regular paprika (not hot); 3 1/2 cups reduced-sodium chicken broth (28 fl ounces); 8 meaty cross-cut veal shanks (ossobuco; 7 to 7 1/2 pounds total), tied; 2 cups dry white wine; 1 (16-ounces) container sour cream; 1 1/2 tablespoons all-purpose flour; Equipment: a 15-by 13-by 3-inch flameproof heavy roasting pan; Accompaniment: tiny dumplings with dill