Dice:
Tomatoes (3 or 4)
Onions (1 medium)
Jalapenos (just 1 or 2, remove seeds and mince very fine - wash hands well and watch your eyes!)
Cucumber (remove seeds) optional
Mince 1 bunch Cilantro leaves (optional)
Mix together, cover with juice of 6 or 7 limes (depends on size, you want enough juice so the veggies are covered but not swimming)
Add a teaspoon or two of salt (to taste - check it as you go)
Serve on tacos, tostadas, tortilla chips, taco salad, enchiladas, burritos, etc. Great on anything that you'd want tomatoes and onions on!