Friendship Dilemma: The rationed cooking

So you use your money to buy ingredients and take out time to cook a meal for you and 2 friends. You are sure that the amount of food you cooked will be exactly enough for just 3 of you...as in, you rationed it well. The food is almost ready and the aroma is making all of you salivate.

Then there is a knock on your door and it turns out that one of your long time friends decided to come and visit.

What would you do?

PS: This just happened to my friend's neighbour who was cooking for all of us. Her friend came to visit just as the food was ready and she reduced the amount of food she gave my friend and I. My friend said that if she was her, she would have kept the food in the kitchen and continued gisting with the visitor till she leaves. She called it "sticking to the plan".