Make sure when you buy fresh Prawns the head armor is still hard, that a sign for the catch being fresh.
De-vein the Prawns; leave the tail as that looks good in presentation. Put these cleaned prawns in a bowl and pour over the lemon juice and sea salt. Coat well in the Juice and keep for 10 to 15 minutes. This kills any smell that Prawns have.
Next add all the ingredients for the second marinade. Take the Prawns from the first marinade and to this Marinade, make sure that Prawns are well covered from all sides. Keep in this marinade for at least 15 minute.
Take a nonstick griddle or a Tava, pour in oil heat till smoking point and cool (Skip this if using Olive Oil). Heat again this time hot enough but below the smoking point and add the marinated Prawns. Cook Prawns on low heat for 5 to 6 minutes on each side then cover and cook for 5 minutes. Check for if the Prawns. Remove from fire and present it on a bed of Mango mix.
A great variation to this recipe is to grill Prawns over a Charcoal grill or Tandoor. This gives Prawns a smoky flavor.
Mango Mix recipe
Mix all the ingredients for Mango mix in a bowl, check for seasoning and serve. This can accompany any other dish too.