One of my favorite if not most favorite salads. I eat it with steak or fish or just about everything. Make sure the avocado is nice and soft and the tomatoes have as much flavor as possible.
For the salad:
200g (cherry) tomatoes
1/2 red onion
3 T chopped, fresh coriander
Mix the ingredients for the dressing in a salad bowl. Taste and adjust if necessary. Dice the onion pretty finely, the coriander roughly, add to the bowl and mix. Cut the tomatoes and avocado in smaller but similar pieces and add to the bowl. You might want to mix everything without the avocado first, to keep it neater.