So just imagine a red mess and you're pretty much there...
0.5 - 1 Red Chillis, depending on heat preferences, seeds removed
1 Large Tomato
3 Spring Onions
1 Large Garlic Clove
1 Glug Extra Virgin Olive Oil
1 Squeeze Fresh Lemon Juice
1 Pinch Salt
Dice the tomato, and finely chop the spring onions. Add to a small bowl. Either finely dice or crush the garlic into the mixture, and then do the same for the chilli, making sure not to lose any of the chilli juice. Mix together with the salt and lemon juice (and leave for around 15 minutes if time isn't of the essence). Finally, add the olive oil and mix well, leaving it for a minute or two before serving. This provides enough for one portion (in my opinion).
This "recipe" could probably be improved with the addition of some form of herbs, but sadly didn't have any fresh ones to hand.
It's a rather juicy sauce, so also great if you're having something that soaks up a lot of fluid (see my adventures with coconut flour for reference).