if you live in a place where tomatoes still have some flavor try this: cut a couple tomatoes in small cubes / triangles, add a tablespoon of olive oil, a teaspoon of red wine vinegar, a dash of tabasco, crumble some good tuna in it (like Tonnino or Ortiz) and sprinkle some oregano and salt on top. Goes well with crusty bread, preferably toasted.

That was my fathers' go to summer meal in Italy and I can't think of anything else I'd rather eat when it's hot outside, preferably with a cold lager.