To make the salsa combine the chopped tomatoes, onion, jalapeno with the finely chopped coriander and red chilli - mix well to combine everything, then add a drizzle of olive oil and the juice of half a lime - taste and season to your taste.
Heat a bbq or pre-heat the grill. Remove the stones from the avocados and drizzle with olive oil and lime juice. Place the avocado halves cut side down on the bbq for 3/4 minutes - the avocado will release itself when its ready, don't try and move before that time as it will stick. On the preheated grill until grill-lines begin to form on the avocado flesh, after about 5 minutes.
To make the herb dressing, place yogurt, mint, parsley and lime zest into a small bowl and mix well, keep a few mint leaves back for a garnish - set aside until you're ready to serve.
When ready to serve, fill each half avocado with a generous tablespoon of the salsa and a dollop of the herb dressing, scatter over with a few mint leaves and youre ready to eat!