I combined cans of yellowfin tuna from Italy (Costco), fat smoked sardines from Morocco (Fattal's) and Alaskan red salmon (ShopRite), including the oil or water in each. I then diced about two-thirds of a medium red onion, adding it along with two or three tablespoons of powdered cumin and Aleppo red pepper to taste. Finally, I moistened it with two or three ounces of extra-virgin olive oil. This made four cups of fish salad -- enough for about 10-12 sandwiches.
I toasted some Italian semolina bread from Newark, spread on hummus and added salad greens. Then came lots of the fish salad, Parmigiano-Reggiano cheese shavings and tomato slices with za'atar spice mixture. My side dish was kimchi, my drink iced tea.