I'm sure this isn't at all authentic, but I like it! Serves 2-3.
1 ripe avocado
1 small red onion
1 chilli pepper
2 tbs lime juice, or 1 tbs each lemon and lime, as preferred.
Put the tomatoes in a bowl and cover with boiling water. Leave for a maximum of 2 minutes, then refresh in cold water. The skins will now slip off easily. Chop the tomatoes, avocado, chilli and onion as finely as you can, and mix in a large bowl with the lime juice, and salt and pepper as liked. This can be eaten at once, of course, but is actually nicer if you make it in the morning to have at supper.