Method:

Prepare the Prawns: Begin by cleaning your prawns. Remove the heads and shells, but leave the tails on for presentation. Use a small knife to devein them (remove the black vein that runs along the back).

Make the Marinade: In a small bowl, combine the olive oil, lemon juice, sliced garlic, chopped parsley, salt, pepper, and optional chili flakes. Whisk until the oil and lemon juice emulsify, forming a simple marinade.

Marinate the Prawns: Place the prawns in the marinade, ensuring each one is well-coated. Let them marinate for at least 30 minutes (or up to 1 hour for deeper flavor).

Grill the Prawns: Preheat your grill to a medium-high heat. If using a barbecue, ensure the grill grates are hot and lightly oiled. Place the prawns on the grill, cooking for 3-4 minutes on each side, until they are pink and opaque.

Serve: Remove from the grill and serve immediately, perhaps with a side of grilled vegetables or a light salad. You can drizzle the leftover marinade over the prawns or serve it as a dipping sauce.

Variations and Tips:

Spicy Version: Add chili flakes or a dash of hot sauce to the marinade.

Substitutions: If you're vegan or allergic to shellfish, you can use thick slices of firm tofu, marinated in the same way, as a substitute for prawns.

Cooking Indoors: If you don't have access to an outdoor grill, you can use a cast iron skillet or grill pan. Preheat it and follow the same cooking time.