The main ingredient in matzo ball soup is matzo meal. This traditional Jewish dish is especially popular during Passover, when leavened bread is prohibited. Matzo balls are made from matzo meal, which is ground unleavened bread, and typically mixed with eggs, water, and fat (like oil or chicken fat). The mixture is then formed into balls and simmered in soup, usually chicken broth, often with added vegetables. The resulting dish is both comforting and nourishing, holding significant cultural and familial importance as a staple during Jewish holidays and gatherings.