Shaved cucumber slices (use your veggie peeler).
Seriously. It's that easy.
The avocado, tomato, yellow pepper, lettuce, mustard seed salami helped too. All piled on top of a plain corn tortilla.
Add a splash of lemon juice with a dash of hot chili pepper and grind some fresh white pepper corns and it is really an easy masterpiece to pull off when the temperatures outside are hot enough to fry an egg on the sidewalk and you can't bear the thought of any food being heated.
Cucumber is a 'cooling' vegetable too, did you know that? That is why Indian food often includes a side dish of cukes, usually with plain yogurt. So shave away those cucumbers and keep the heat down.
