METHOD:
Pat dry and cut the fish in 2 cm cubes with a very sharp knife. Macerate with the lime juice in a bowl for 30 min. After that drain the juice and add salt, onion, tomatoes, chilli and coriander. Serve over tostadas (you can buy them ready to eat or simply shallow fry corn tortillas in neutral oil till crispy) with guacamole, chipotle mayo and spicy salsa.
For the guacamole mix all ingredients but coriander in a bowl, smashing the avocado till smooth and creamy. Season to taste and add fresh coriander.
For the chipotle mayo mix all ingredients and check seasoning, should be tasty enough but if you like add a little pinch of salt .