The devil is in the detail, as the saying goes. The original version of the phrase was actually “God is in the detail”, so whichever way you look at it, details clearly make a difference. Today’s recipe is a perfect example of this. It would be a simple tomato and onion salad, were it not for the capers, mint, and above all lemon zest. But it’s precisely these minor additions that make the salad worth telling you about. And nor should we overlook the most important detail of all: this is a salad for tuna, not a tuna salad. A salad for tuna but not a tuna salad? Perhaps some…