This Cucumber Radish Salsa is a great example of how easy it can be to build salsas that don't rely on tomatoes or tomatillos. A light, vibrant salsa that works great on tacos, tostadas, and even pita bread.
I usually twist off and discard the thicker, bottom portions of the cilantro but keep the upper portion of the stems.
I think it's worth using an English cucumber as the crisp crunch works well in this recipe.
The heat-salt-juice levels might take some tweaking but it's worth experimenting with them. You'll be able to apply similar proportions to other, similar salsas.