Mix one tablespoon of lemon zest with the crushed garlic.
In a skillet, melt your butter over medium heat. Once melted, add salt, parsley and the garlic and lemon zest mixture to make a 'butter brew.' Mix with a spatula.
Pour the lemon juice over the shrimp and sprinkle with two tablespoons of lemon zest . Add the prawns to the skillet. Cook them for about one minute, flip and then cook for another minute, until the flesh is firm and no longer translucent.