De-vein the prawns using a small scissor or a paring knife to cut through the shrimp shells along the top, slicing into the flesh at the same time to expose the vein. Make a long incision down the back and use the tip of the knife or a toothpick to lift out the vein. Wash the prawns with lemon and water. Drain and pat dry. Place in a large mixing bowl. Add onion powder, garlic granules, old bay, paprika, black pepper, allspice, 2 chopped scotch bonnet and fresh thyme to the prawns, Rub into the prawns. Cover with cling film and leave to marinate in the fridge for an hour.
Preheat 2 tablespoons of oil in a sauté pan over medium heat.
Add shallots, garlic and 1 diced scotch bonnet and sauté for 2-3 minutes, Toss in prawns, stir to combine and cook for 2 minutes, stirring frequently,
Rinse out the mixing bowl with 60 ml (¼ cup) water and pour over the prawns. Add in butter. Cover with a lid and leave to simmer over low heat for 6-7 minutes.
Garnish with chopped parsley and serve with a lemon wedge.