Today, I passed by the door of the snack bar, and the slogan said "I can't forget it". Is this word used wrongly?

it's wrong, it should be "you can't forget it once you taste it"

try it

① try a little; Distinguish the taste: ~ ~ salty and light.

② experience; Experience: hard preparation ~ ~ the sweetness of physical exercise.

③ ever: never ~ why ~.

compensation

① return; Compensate: ~ still have to lose ~.

② satisfaction: get what you want.