My mother has to perpare all the lunch food. Before the cafeteria's customers arrive at 11:30 fix the fragment in the sentance

Correct answer: My mother has to cook/prepare all the food for lunch (or make lunch) before the cafeteria's customers arrive at 11:30a. m.

There were few mistakes, as you can see, we cook or prepare food/meal and we use 'for' when we want to say the purpose of the action.