Well, you have to cook some before you eat them and some definitely taste better than others. The fruit and leaves of the prickly pear cactus is one of the most well known of the edible cacti. Their leaves and fruit are very favorable and are a staple of many dishes in Central America. Another cactus which has delicious fruit is the dragon fruit cactus which is a vine-like cactus with long, fleshy leaves and bright red or yellow fruit with a white or red center and tiny black, crunchy seeds with high nutritional value. The plant is also called the night-blooming cereus because it has large, fragrant white flowers that only bloom at night.
And then there are several species of agave succulent plants that can be made edible, such as the Agave tequilana which is used in the production of tequila, as well as edible palms such as the saw palmetto. The heart of the stems are tender enough that you can eat it raw or it can be cooked as a vegetable. It’s seeds are big business too because they are made into herbal supplements said to treat benign prostrate conditions.