- Preheat oven to 400 degrees.
- Place meatballs in a 8 x 8 or 9 x 9-inch pan. Bake for 25-30 minutes or until thoroughly heated.
- In a small bowl, combine ketchup and mustard.
- Place a heaping teaspoon of ketchup mixture on the bottom of roll. Place a meatball on top. Follow with a rounded teaspoon of pickle relish. Place top half of roll over top. Repeat for remaining meatballs and rolls.
- Serve immediately on a large platter.