Roman-Style Meatballs with Gnocchi alla Romana

INGREDIENTS

• 1 1/2 cups fresh bread crumbs
• 1/2 cup milk
• 4 oz. finely chopped prosciutto
• 1 lb. ground beef
• 1 lb. ground pork
• 2 eggs, lightly beaten
• 1/2 cup grated Parmigiano-Reggiano cheese
• 2 Tbs. finely chopped fresh flat-leaf parsley
• 2 tsp. finely chopped fresh oregano
• 6 Tbs. finely chopped fresh basil
• 5 garlic cloves, minced
• 1 tsp. kosher salt, plus more, to taste
• 1/2 tsp. freshly ground pepper, plus more, to taste
• 5 Tbs. olive oil
• 1 yellow onion, diced
• 1 can (28 oz.) crushed tomatoes with juices
• Gnocchi alla Romana for serving (see related recipe at left)