The term "nopal cactus" refers to a specific type of edible cactus that is commonly used in Mexican cuisine. The nopal cactus, also known as prickly pear or tuna, has a thick, fleshy stem that can be eaten raw or cooked. It is high in fiber and antioxidants, and is often used to make jams, syrups, and other sweet treats. In addition, the nopal cactus is believed to have health benefits such as aiding digestion and regulating blood sugar levels.