Today I asked if they liked pickles. They said they did. I put a dill pickle slice on their plates and had them help me make tuna salad. They saw me empty the tuna into a bowl and shouted, "Ewww! We are not eating cat food!"
After some convincing, and a chocolate bribe, they each ate half a sandwich and liked it! I was published in a Parent's Magazine book years ago: tips to get kids to eat.
Serve sloppy Joes or tuna salad in a mini ice cream cone. Make it unique, let them help, and they will usually eat.