The most common sushi is wrapped in ham and cucumber, and there are also yellow radishes specially made for sushi. The doorways are often covered with egg skins with first-class pickled seasoning radishes (yellow radishes), which can be wrapped without cutting. Then another simple way is to replace ham with canned tuna, which is convenient and delicious, as well as pork floss and braised pork strips. I learned how to do it recently, and it feels good, haha.
Yellow radish is a kind of whole package, which is used to improve the taste and color of sushi, but it is rare in general supermarkets, and some are packaged in small pieces of several dollars. I tried to buy it online, about ten yuan each. My home is close to the seasoning wholesale market, and then I went there directly to find a small shop specializing in the wholesale of sushi and Korean cooking materials. It's very cheap, and all kinds of materials are complete. You can go to the food seasoning wholesale market without any trouble.