Use a mix of ground beef and Italian sausage for extra flavor. Add veggies like bell peppers or mushrooms for added nutrients and taste. For a bit of heat, include crushed red pepper flakes in the sauce. Consider using whole-wheat pasta for a healthier twist. To store leftovers, let the spaghetti cool completely, then transfer it to an airtight container. It can be stored in the refrigerator for up to 3-4 days. For longer storage, you can freeze the spaghetti for up to 3 months.