YOU SAID:

We walked through the door there was someone selling mochi

INTO JAPANESE

ドアをくぐると、餅を売っている人がいました。

BACK INTO ENGLISH

When I passed through the door, there was a person selling rice cakes.

INTO JAPANESE

ドアをくぐると、お餅を売っている人がいました。

BACK INTO ENGLISH

When I passed through the door, there was a person selling rice cakes.