Absolutely, you can always cook your own food in Suvie.
You can cook any protein that you would normally use with the sous vide style of cooking. For vegetables we suggest those that do well steamed for typically no longer than 20 minutes. For starches: rice, whole grains, and quinoa do very well. For pastas, we recommend using extruded shape noodles (such as macaroni or farfalle bow ties). Because Suvie does not have a stirring element, longer pastas such as spaghetti can "clump."
Additionally, you can take advantage of Suvie's Slow Cook function to cook your favorite slow cook recipes in your Suvie.