Some Americans use the word "fix" for the preparation of food:
What are you fixing for dinner?
They fixed a big dinner for their guests.
Sandra fixes breakfast and lunch for her kids.
The word "fix" is also used by some Americans to describe any sort of preparation. This is a form of slang which I don’t recommend, but you might hear it used:
They’re fixing to leave soon.
I’m fixing to buy some land.
He’s fixing to get married. (Notice I dropped the "g" sound in "fixing." People who use "fix" in this manner are likely to drop the "g.")