new to mothering step children

I married a man with 4 children, 3 living at home. He had sole custody of the children. Along with the long days of work and travel often 10-12 days their eating habits were limited to fast processed foods. Needless to say introducing them to other cooking is a challenge, and I am a Chef, I might add–their ages are 17, 11,10 any suggestions would be appreciated. For New Years eve I served stuffed artichokes along with our meal, my husband and I were the only ones who ate them!