KATHY: Yam leaf is one of my favorite Asian leafy greens. Popeye had spinach; I have yam leaf. It’s the most underappreciated vegetable, in my opinion. I eat yam leaf anytime I find it in the Chinese markets. It has more protein than spinach, double the amount of fiber than kale, and the same amount of vitamin K and A as those greens. I find the texture of the yam leaf to be the most palatable and tastiest: soft, tender leaves with a crunchy stem and no bitterness. It’s sup