Cucumber, tomato and mackerel salad

I love canned mackerel. (The plain kind - not the ones marinated in sauces.) You can get a can for about a euro here, and it's enough for two lunch salads.

Lettuce or greens, washed
ripe tomatoes, sliced
cucumber, sliced
carrots, peeled and sliced
vinaigrette
nutritional yeast flakes (optional, but sooo good)
freshly ground pepper

Toss the lettuce with a little vinaigrette. Top with veggies, mackerel, then yeast flakes. Voilà!