Pat the prawns completely dry with paper towels. In a large sauté pan over a medium flame, heat the oil until hot. Add the prawns along with a pinch of salt and cook without moving for 3 minutes. Add the garlic and cook for another minute without moving. Add the cilantro and lemon juice and stir until combined. Cook for another 2 minutes, until the prawns are completely opaque. Divide between 2 plates and season with a pinch of salt and pepper to taste.