Serve with meatballs, remaining sauce, and grated cheese. Garnish with grated Parmigiano-Reggiano. Meatballs can be made and simmered in sauce 5 days ahead and chilled (covered once cool).
Season with salt and pepper. Remove the meatballs from the oven and place in the gravy pan. Simmer gently for 5-10 minutes to allow the flavours to combine. Serve with a sprinkling of dill ...