The main ingredient in sauerkraut is cabbage. Sauerkraut is made by finely shredding cabbage and fermenting it naturally with the help of lactobacillus bacteria. This fermentation process not only preserves the cabbage but also enhances its flavor and nutritional value. The probiotic content created during fermentation can benefit gut health, making sauerkraut a popular food choice for those looking to improve their digestion. Typically enjoyed as a side dish or ingredient in various recipes, sauerkraut is a staple in many cuisines and represents a classic example of food preservation.