Answer:

The "big root" in sushi is pickled radish, also called daikon.

Sushi:

Sushi is one of Japan’s traditional delicacies. The main ingredient is rice cubes seasoned with sushi vinegar and maintained at human body temperature, plus fish, seafood, vegetables or eggs as ingredients. It is delicious and very popular among Japanese people. Sushi has been recorded in the "Enki-shiki", a legal code of the Heian period completed in 927 AD.

Sushi ingredients:

1. The necessary material for sushi is rice. Authentic Japanese sushi uses Japanese pearl rice, which is fat and slightly sweet. After the rice is cooked, add appropriate amounts of sushi vinegar, sugar, salt and other seasonings, and wait until it cools down before using it to make sushi.

2. Sushi seaweed: whole shape, half cut.

3. Sashimi: salmon, tuna, amberjack, sea bream, bonito, mackerel.

4. All kinds of seafood: squid, octopus, shrimp, eel, fish roe, sea urchin, Arctic shell and other shellfish.

5. Fruits and vegetables: Dagen (pickled radish), pickled plums, natto, avocado, cucumber, fried tofu.

Red meat: beef, horsemeat, ham, sushi.