Wash the prawns and pat them dry. In a bowl, add minced garlic and salt and marinate for 15 minutes. In the meantime get your condiments ready.
For the pineapple salsa – mix all the ingredients in a bowl and chill for 20 minutes.
For the guacamole – cut the avocado in half, and scoop it out. Smash the avocado, mix in the ingredients and mix well. Chill.
Heat oil in a pan, add the marinated prawns along with the garlic. Cook on both sides for about 90 seconds.
To assemble the taco, smear some sour cream on the base, add a piece of the prawn, top with guacamole and pineapple salsa. Wash it down with chilled beer.