...All cultures around the world have their own form of fermented foods that they consume regularly! In Korea they eat kimchi, in Japan they eat miso, Greece has its yogurt, Germans like their sauerkraut, and that's just the beginning.(links for more information below). So start consuming fermented foods (in moderation), it could save your gut. The first fermented food on your list could definitely be, TEMPEH!
You can make a sandwich out of basically anything. All you need is a good sauce, some vegetables and a protein component. Check out these suggestions and make your own "perfect" sandwich!