Ingredients:

1/2 cup finely diced Onions
1 Garlic clove
1/2 – 1 lime (as per taste)
1/2 teaspoon salt (adjust to taste)
1 to 2 jalapeno peppers / 1-2 Tablespoons minced (adjust to taste)
4 plum Tomatoes, diced finely (makes 2 cups approximately)
1/2 cup chopped Cilantro or Coriander Leaves
 
Method:

Finely chop the onion and place it in a small bowl.
Using a microplane, grate the garlic into the bowl (or use a garlic press or very finely chop it with a knife.)
Add the rest of the ingredients and mix well. Taste and adjust for seasoning, if required.
Cover and let it sit in the refrigerator for at least 2-3 hours, to let the flavors seep in.
Serve as desired.