Tacos de NopalitosMexican tacos are generally made with small soft corn tortillas, about 4 inches in diameter. It's quick hand-to-mouth food that's meant to be eaten as soon as it's made. Although still a rarity in the United States, fresh cactus is often used in Mexican kitchens, and serving them in tacos is easy with cactus strips sold in jars. Buy the kind packed in water. Don't buy those in brine.