Oh man... I have been going through this with my daughter for years now. She loves fresh foods like fruit and veg which is fantastic but there are some things that she won't have. Recently sneaked mushroom into her favourite tuna lasagna and won that round by asking her if she liked it then showing her the shrooms after she said it was delicious. I won the food battle but I think I lost a little bit of trust in doing so...
Haha, I was going to suggest that your wife try this technique with you...