Fast Tuna (one of my favorites for when I don't want to cook but want something with taste and texture)
(I use foil packages)
Fresh scallions (green onions -- I grow my own)
Lentil sprouts (another thing I grow aboard)
Mayonnaise or salad dressing (whichever is handiest)
Mix ingredients together and voila:
It's not fancy however it is tasty. I've substituted other meats (ham, pork, etc.) and found it equally refreshing. The sprouts add texture as do the scallions -- bland foods are not my thing.