I made this the other day -
Small red onion, green chilli, deseeded, medium red pepper, deseeded and quartered. Handful basil leaves, juice of 2 limes, 2 tomatoes, deseeded and chopped finely, 2 pineapple rings, diced.
Finely chop onion and chilli in food processer until almost pureed. Add the red pepper and basil leaves and process lightly so the pepper stays chunky. Stir in lime juice, tomatoes and pineapple. Season.
Hope this is easy enough - I used cherry tomatoes and just cut them up.