If you eat salty food, you can add salted duck eggs instead of eggs. Although it will feel a little strange, as long as you feel delicious. If you want to be spicy, you can add a little of what you want, but sushi is really more important than adding ingredients to flavor it.
In fact, everything in sushi can be wrapped, but you have to do it according to your own preferences. Otherwise, all the characteristics of sushi will be wrapped, so you should just burn the ingredients and eat them as dishes!
There are different opinions about the origin of sushi. In ancient Southeast Asia and the coastal areas of China, there were foods similar to sushi, but their forms were different.
Japanese sushi mainly consists of rolled rice with laver or seaweed, sashimi, cucumber, pork floss and burnt onion, with mustard, horseradish, soy sauce and vinegar.
On the coast of China, there is a kind of cylindrical rice ball made of glutinous rice, egg yolk, crispy skin, peanuts, vegetables and cooked shrimps, which is called a rice stick. It is wrapped with a layer of cooked dough. The method is a bit like holding sushi, but the material and shape are different. According to legend, the rice stick came from Yue State (Zhejiang Province) in the Spring and Autumn Period and belonged to the traditional food of the ancient Yue people.