Fish Taco

Ingredients:

1 garlic clove, chopped finely
1 tablespoon finely chopped fresh coriander stalks
1/4 cup lime juice
600g white fish fillets
1/3 cup plain yoghurt
1 tablespoon finely-chopped fresh coriander leaves
1 tablespoon olive oil
1 tsp tobasco
1 baby cos lettuce, shredded
1 medium tomato, roughly chopped
1 small avocado, roughly chopped
8 flour tortillas