Lu Erxiong finds whole grain rolls unpalatable. Actually, the children of the Lu Family are accustomed to eating white rice, white flour, and various expensive foods. Occasionally having some sweet potato porridge is not a hardship for them; instead, they find it novel and, under the supervision of their parents, eat it cleanly and honestly.
If you taste it carefully, there are no other flavors mixed in. The cooked dried sweet potatoes have a slight sweetness and are quite tasty.
The main reason is that Feng Qingxue is quite strict. She always serves meals according to portion and doesn't allow them to leave any food.
Once a habit is formed, it is difficult to change.
Xibao is more sensible. He lived with his grandfather in his hometown and understands the hardships of life better than his younger siblings, thus cherishing food.