Cooking

I know how to cook, and whenever I do cook it is good, unless you are under the age of 18.  I do not cook extravagant, gourmet meals, just everyday food.  But for some reason my children never seem to like what I cook.  They try something at my mother's house and I like it, then when I make it at home they don't.  This is very frustrating, especially in these times when I am trying to save money where I can.

Today I made 15 bean soup with turkey, pork loin with potatoes and carrots, and greens.  This is enough food to last for the week (lunch and dinner for me and dinner for my kids).  I am sure tomorrow night I will hear "there is nothing to eat in this house" from one of my children.

What is a mother to do?  I am open for suggestions.