The letter X is an uncommon letter for very many words to begin with in general but you might be surprised at how many foods start with the letter X. This list of foods includes: Xanthan gum which is used for thickening a lot of other foods, Xavier soup an Italian dumpling soup, Xavier steak, Xinomavro grapes, and Xylitol which is an all-natural sugar substitute.
You might have heard of some of the foods on this list but there are more foods that begin with X out there to explore as well. Xacuti is an Indian curry. Xigua is an African melon and Xnipec is a Mexican salsa. Though X foods are rare they certainly do exist.