For a vegetarian option, substitute the ground beef with lentils or crumbled plant-based meat. San Marzano tomatoes are preferred for their sweetness and low acidity, but other high-quality canned tomatoes can be used. The Bolognese sauce can be made ahead of time and refrigerated for up to 3 days or frozen for longer storage. Adjust the amount of zucchini noodles per serving based on your preference. You may not need all 6 zucchini.