I used to make this refreshing summer salad with my friend and co-worker Viren before he returned to Gujarat, India. It's a great burst of summertime flavor, with just summer-fresh tomato and cucumber, maybe a little onion, and salt and pepper. No oil or vinegar are needed. The contrasting colors look like little gems, and the flavors are great together.
There are many ways to make a Kachumber Salad, and many of my Indian colleagues had other ideas. I'll call this one Viren's Kachumber Salad because I learned it from him.