Ground Beef Roll, Stuffed with Ham and Vegetables

Ingredients

• ½ pounds ground beef
• ½ cup very finely chopped cauliflower
• 1 egg
• ½ onion, chopped
• 1 large green bell pepper, seeded and chopped
• ½ cup fresh mushrooms, chopped
• Garlic powder to taste
• Salt and ground black pepper to taste
• 1 cup grated Parmesan cheese
• 1 cup of finely sliced celery
• ¼ pound thinly sliced deli ham