Ceviche

Slice the red onion thinly with the grain, and toss in a bowl with salt, pepper and lime juice, coating well.

Add the fish, garlic and fresh chilies, and gently mix.

Add the tomatoes, cucumber, cilantro and olive oil, and give a stir and marinate in the refrigerator for at least 30 minutes before serving (45-60 minutes is ideal).

Before serving, taste and adjust the salt and heat. Add more salt or chilies if you like.  If adding avocado, gently fold it in right before serving- you may need to add a pinch more salt.

To make the optional Avocado Sauce, blend all ingredients in a blender until smooth, adding a bit more water or oil, if needed to get the blades going.