Toss warm spaghetti with ricotta cheese and grated lemon peel, then top with beef meatballs and oven-roasted broccoli, cauliflower and red onions.
Whisk broth and browned butter into mashed butternut squash to make a sauce, then toss with spaghetti, fresh sage and pan-fried turkey meatballs.
Mix finely chopped raw, fresh asparagus with ground chicken. Form into mini meatballs and simmer in a pot of chicken broth; stir in spaghetti and toss with sugar snap peas.
Combine ground beef and sausage with scallions and breadcrumbs; form into meatballs, thread onto skewers and grill. Serve over spaghetti with fresh-basil-laced marinara sauce.