Spaghetti with meatballs

Serves 4 people Ingredients: For the meatballs: 1/2 lb ground beef 1/2 lb ground pork 1/2 lb ground veal 3 slices of Italian bread soaked in milk or water then squeezed dry 1/2 medium onion, finely chopped 2 tablespoons of parsley, finely minced 1 teaspoon of garlic powder 1/2 cup grated Pecorino-Romano cheese 2 eggs