Ingredients
225g tomatoes, finely chopped
1 red onion, finely chopped
1 red chilli, very finely chopped
1 green chilli, very finely chopped
7g fresh parsley, finely chopped (or coriander if you like it)
Juice of 1 lime
½ tbsp balsamic vinegar
1 tsp caster sugar
Salt and pepper 
1 tbsp olive oil

Method
Put all the ingredients in a bowl and check the seasoning, adding more balsamic, sugar salt or pepper if needed.