For the king prawns in garlic butter, peel the king prawns (leave the prawn tails).
Sprinkle with cayenne pepper, cracked pepper mixture and salt and marinate for about 1 hour. Peel and crush garlic cloves.
Heat a skillet or grill well, place butter and garlic on top. Add the shrimp and grill for 3-5 minutes.
Arrange the king prawns in garlic butter on the plate, drizzle some lemon juice and garnish with a slice of lemon.