What do Japanese's people eat for lunch?

Answer 1

grilled meat(Tetchan,Harami,Karubi,etc)
Tetchan :intestine
Harami:tender meat around the diaphragm
Karubi:short ribs

There are also the bento boxes and onigiri.
Bento-boxed lunch
onigiri- kinda like a triangular sandwich/sushi

Answer 2

the Japanese eat many thngs for lunch but the most famous is probably sushi, they also have noodles and some stuff you might find at a Chinese restaurant.