Remove the seeds and the bitter white innards from the peppers. Finely dice the peppers and onions. Add the finely chopped garlic. Combine the vegetables in a large bowl and season with salt and pepper.
Heat the olive oil in a saucepan and pour over the vegetable mix.
Peel the tomatoes and cut them into small cubes. Once the oil has cooled, add the tomatoes and season again. Add a splash of vinegar before covering with plastic foil and placing in a bowl in the refrigerator for several hours to combine the flavours. Add the coriander just before serving.
Prime Rib:
Crush the garlic with a pinch of salt using a mortar and pestle to make a paste.
Add the remaining herbs and spices to the garlic paste. Place the prime rib in a deep dish and baste it with the garlic paste. Cover with plastic foil and refrigerate for at least 2 hours (or overnight if you’re not short of time).
Remove from fridge at least 1 hour before cooking to avoid heat shock.
Heat the barbeque and brown the meat for a few minutes on both sides. Reduce the heat, continue to cook until desired temperature is reached (about 7 minutes either side for a rare steak). Let the prime rib rest for a few minutes before serving. Serve with criolla salsa.