Preheat the grill to medium-low.
In a large bowl, toss prawns in olive oil until evenly coated.
25 raw king prawns, 3 tbsp. olive oil
Place the prawns on the grill, leaving space between them to prevent overlap. Grill for about 2 to 3 minutes on each side, or until they turn pink.
Place on a platter surrounded by lemon wedges and topped with parsley leaves for garnish.
1 lemon, Parsley
For Romesco sauce: Begin preparing the sauce by blanching the tomatoes. Boil a small saucepan of water and place the tomatoes in the water for about 30 seconds. Remove them and immediately run them under cold water. Peel and discard the skins; chop the tomatoes.
2 vine tomatoes
In a medium saucepan over medium-high heat, sauté the onions and 3 of the garlic cloves in 2 tbsp. of the olive oil. Cook until translucent and tender, about 5 to 7 minutes.
1 onion, 4 garlic cloves, 4 tbsp. olive oil
Add the pimiento, chili powder, stock, and wine to the saucepan. Allow the mixture to simmer, covered for about 30 minutes, stirring just a few times.
1 canned pimiento, ½ tsp. chili powder, 5 tbsp. fish stock, 2 tbsp. white wine
In a blender, combine the remaining olive oil, garlic, and toasted almonds. Blend until smooth.
10 almonds
Add the tomato mixture from the saucepan to the blender. Blend all the ingredients until a smooth sauce is formed. Add salt to taste.
Sea salt to taste, 1 tsp. red wine vinegar
Serve sauce with prawns.