The food that the fox had was.... Question

Another popular(?) series of Japan-Korea pun quiz.
It may be a little difficult today!

Here is the question.

One day, someone is knocking on the door of your house.
When you open the door, to your surprise,
A fox was standing there with a certain food.
Now, what is this food?

Here's a hint...

The ''fox'' is ''knocking'' on the door!
The answer will be in the next delivery........................