1 head size pepperoni rolls
1/3 medium onion, diced
1 clove garlic, minced
3 cloves celery seed -- peeled, seeded and crushed
1 teaspoon dried minced onion flakes
1 teaspoon minced sweet pickle relish
1 1/2 tablespoons beef bouillon granules, diced
1/2 teaspoon salt
1/4 teaspoon ground black pepper
12 ounces shredded mozzarella cheese
8 ounces shredded Parmesan cheese