I've been cooking a lot of legume/veggie soups and stews lately. I've found that I can puree beans, bread crumbs and tofu for a creamy consisency, and can add healthy condiments for spices/flavor. My next experiment will be tempeh. What can you recommend I try, including slow cook ingredients? I'm not much for chemical meat-substitute broths, but would like something that adds depth and roundness that I'm not aware of wouldn't consider for soup.