Maggi seasoning is a food flavor enhancer that is available in a thin, concentrated dark brown liquid, granulated powder, and cube form. Invented in Switzerland during the late 1800s and introduced in Germany, it's an ingredient with uses that have transcended cultures, dishes, and cuisines, thanks to its umami-rich, soy sauce-like flavor. Maggi shows up in sauces, stir-fries, soups, and more.