Mix the spices and put them into a plastic zip top bag. Add the Prawns and shake. Set aside in the fridge.
Put the egg yolk, dijon, juice and zest into a blender or processor. Blitz till combined and creamy. Slowly add the oil with the blender going until the mayonnaise is thick. If the mixture is still thin when all the oil is added add a little more.
Season with smoked salt and pepper and a little more lime juice.
Put the oil into a deep pot and heat to around 180C/350 F or until a piece of bread dropped into the oil sizzles.
Add the prawns a few at a time cooking for approx 8 minutes or until starting to colour. The shell should be crispy and the inside moist. Test one.
Drain on kitchen paper and sprinkle with a tiny bit of extra smoked salt and chopped coriander