Beef and Vegetable Sandwiches

In a large nonstick skillet cook ground beef until meat is brown. In a 1½-quart slow cooker combine cooked beef, frozen vegetables, sweet pepper, tomato paste, balsamic vinegar, Worcestershire sauce and salt.

Cover and cook on low-heat setting for 4 hours or on high-heat setting for 2 hours. To serve, spoon about ½ cup beef mixture onto each bun bottom. Add bun tops.