1 1/2 pounds lean ground beef
1/4 cup olive oil
4 teaspoons ground flour
1 onion, chopped
3 tablespoons orange juice, divided
1 (8 ounce) container yogurt
3 sprigs parsley leaves
1 teaspoon cayenne pepper
1 (6 ounce) bottle curry juice
1 (8 ounce) package bag (1/2 pound) cans crushed tomatoes
1 (16 ounce) container water chestnuts
salt and freshly ground black pepper
1/2 cup sherry