Leftovers stewed together are called folding baskets in the northeast. Folding reed is a unique term in old Beijing, Hebei and Heilongjiang. The details are as follows:

Folding reed:

Beijing dialect, also known as "combined dishes". Refers to the leftovers that are poured together after a banquet. The Beijing Dialect Dictionary explains: "Let's eat the banquet, and the rest of the dishes, regardless of the type, are all poured together ... also called' folded vegetables'." In the past, people were not rich, and the leftovers on the first day were reluctant to pour, and they were folded together the next day to stew. The leftovers had a special taste and some people liked them. Until the end of 1970s, there was a custom in the suburbs of Beijing: the dishes left over from weddings, funerals and weddings were mixed together and sent by the main family to all households in the village.

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Before the 1950s, there were small restaurants in Beijing that monopolized folding. On the first day, they bought leftovers from big restaurants at low prices and sold them the next day. In recent years, some restaurants in Beijing have similar folding baskets. For example, a restaurant has a mixed meal with minced meat and various dishes, which is fried with soy sauce and tastes good. There is also a fast food restaurant in Taiwan Province, which is called "Bowl Rice". It is also mixed with vegetables and eggs, and it is also quite delicious with braised diced meat and gravy, but it is not sour overnight.

Reference to the above content? Baidu encyclopedia-folding reed