Finely chop the red onion

Deseed and finely chop the chilli

Chop the tomatoes

Halve the avocados and scoop out the flesh

Put into a basin and squish it up with your hands

Add the tomatoes , onions , chilli and coriander

Mix well . Add a pinch of salt and pepper . Squeeze over the lime making sure the avocado is covered .

Cover tightly with cling film and chill