Salsa Criolla

• 2 red onions, sliced as fine as possible
• 1 tbsp vegetable oil
• 1 ají amarillo, seed

Season the sliced onion with a little salt. Rinse in plenty of cold water and drain thoroughly. Place the onion in a small bowl and season again with salt, key lime juice and vinegar. Add the ají amarillo, vegetable oil and cilantro or parsley. Mix well.