This is really easy and it tastes great.
1 large can diced tomatoes
1 can Rotel tomatoes
1 large white onion
3 jalapino peppers (add more or less to taste)
1 clove garlic (minced)
1 tablespoon cilantro (add more or less to taste)
Salt and pepper to taste
Finely chop the white onion (food processor works great) and place in a medium size bowl. Drain the tomatoes and the Rotel tomatoes and add to onion.
Heat a small frying pan with a small amount of olive oil and roast the garlic. Remove the seeds from the jalapinos and finely chop. Add to the garlic in the pan and sear until the skin starts to blister.
Add this to the tomatoes and onion. Salt and pepper mixture and add the cilantro. Refrigerate overnight and chow down with some good tortilla chips.
This salsa is also good to cook with. It takes about 15 minutes to prepare start to finish.