You don't need a pot simmering on the stove all day to create some cozy magic. This easy lentil soup starts with browning slices of kielbasa—a Polish sausage, which imparts lots of flavor in little time. Then two all-star kitchen shortcuts are used to shave minutes off of prep: canned diced tomatoes and lentils. (Take note; always keep these handy for quick meals.) Simmer it all along with onion, celery, and fragrant rosemary to create a soup that is aromatic, nourishing, and satisfying. Make it yours and swap in chopped carrots if you don't have any celery, or use thyme instead of rosemary.