Salsa Mexicana (Cruda)

Ingredients:
1 md Tomato (6 ounces)
4 tb Finely chopped white onion
2 tb Roughly chopped fresh
-coriander
3 Chiles seranos, finely
-chopped, with seeds
1/2 ts Salt, or to taste
1/3 c Cold water
Instructions:
Chop the unskinned tomato and mix with the rest of the ingredients.