Piedmontese Meatballs

Ingredients

• 2 tbsp minced garlic
• ¼ cup chopped shallots
• ¼ cup chopped leeks
• Olive oil, as needed
• 2 tsp fennel seeds
• 2 tsp dried basil
• 2 tsp dried oregano
• 2 tsp salt
• ½ tsp black pepper
• ½ tsp nutmeg
• ⅔ cup milk, plus more as needed
• 2 pounds 85% lean Certified Piedmontese ground beef
• 1 cup Parmesan cheese
• 2 eggs
• ½ bunch parsley
• ¼ bunch fresh basil
• 1½ tsp Dijon mustard
• 2 tsp Worcestershire sauce
• ½ cup beef broth, plus more as needed
• 1½ cups bread crumbs (optional)