2 medium onions, sliced
2 packages (12 ounces each) frozen cooked Swedish-style meatballs
2 jars (12 ounces each) beef gravy (or make brown gravy from a packet)
1 teaspoon ground nutmeg
8 hoagie buns (about 7 inches long)

1. Place onions in 3 1/2- to 4-quart slow cooker. Add frozen meatballs and gravy.
2. Cover and cook on low heat setting 8 to 10 hours.
3. Stir nutmeg into meatball mixture. Cut hoagie buns horizontally almost in half. Place 6 meatballs in each bun. Top with gravy.