There are different varieties of yam. Some yam varieties are crispy even when cooked, such as vegetable yam. Different varieties of yam have different hardness and texture. Some varieties are crisper and some are softer. If the yam variety you choose is relatively hard, it will still be brittle even after cooking. The vegetable yam is a relatively crisp yam with a thick shape and a diameter of about 5cm. Because vegetable yam is crisp and tender, it is suitable for stir-fry or hot pot. If it is made into yam and fried fungus, both black and white ingredients will be crisp, tender and delicious.