Melt the butter in a large frying pan over high heat.
Pat the shrimp dry with paper towels and season with the salt and pepper.
Add the shrimp the pan in batches (to avoid over-crowding) and cook until the shrimp are cooked. Remove from the pan and set aside.
Add the garlic to the pan and allow to fry for a few seconds before adding back the shrimp. Add the lemon juice and parsley and cook for another minute.