Enough. According to the "Recipe Encyclopedia", it is known that the ingredients for the stir-fried yam dish require 2 to 4 hardcore yams, 3 to 5 slices of cabbage or baby cabbage, etc. 4 hardcore yams are enough. Iron yam is one of the yam varieties. Rehmannia glutinosa, yam, achyranthes, and chrysanthemum are also known as the "Four Huai Medicines".