You said that there is a kind of snack, which tastes sour, sweet, cold and refreshing, and I forgot its name. The following is my opinion.

1. As you said, it tastes sour, sweet, cold and refreshing. The first thing I think of is cold noodles from North Korea, because there are fruits and vegetables, tomatoes, pear strips, etc. in the side dishes, there are famous kimchi and spicy cabbage from North Korea, so it is sour and sweet. Because it has not been thermally processed, it can be iced according to personal taste, so it is cool.

2. Korean cold noodles are a kind of traditional ethnic food which is well-known at home and abroad and deeply loved by people. Generally, beef soup or chicken soup is used, and the side dishes are spicy cabbage, sliced meat, eggs, shredded cucumber and pear strips. When eating, first put a small amount of cold soup and a proper amount of noodles in the bowl, then add seasoning, and finally pour the soup again. Its noodles are fine and tough, its soup is cool, and it is sour and spicy.

there is a snack that tastes sour, sweet, cold and refreshing. I know its name. It's bean jelly. Put it in the freezer. You can add vinegar and brown sugar to the bean jelly in a bowl, as well as watermelon and a proper amount of raisins. When you eat it, stir it. It's very delicious.

I have been to India, and I have seen a very exciting snack on many streets in India. The people who bought it were all bite by bite, and they enjoyed it very much. Later, I learned that this seemingly dangerous food is called "flame betel nut". It seems to us that only magic shows can occur when a group of burning food is put into your mouth, but Indians are used to it, and this way of eating betel nut is very popular in India. The flame betel nut snack is to wrap the rich stuffing with betel nut leaves, then light the leaves with a lighter and feed them directly to the customer's mouth by the boss. The action is very rapid and the flame entrance goes out. Diners describe flame betel nut in this way: it tastes cold and cool, cool and fast, sour and sweet, and the throat is very comfortable after eating.

when I saw the words "sour and sweet", a snack immediately came to my mind, that is "Korean cold noodles".

the Korean cold noodles I'm talking about are not the kind of roasted cold noodles baked with a cake, eggs and seasoning. But like noodles, the kind of soup and water.

The taste of noodles is generally salty, but the taste of Korean cold noodles is "sour and sweet". Why is it cold noodles? It's that the noodles are cold, and with the sweet and sour soup, it tastes ice-cold and refreshing!

I was deeply impressed by this characteristic which is different from most pasta. Maybe this snack you are talking about is Korean cold noodles!