Whole sea bass from the Big Green Egg with herb salsa

Ingredients

• 1 sea bass of approx. 1 kg, scaled and cleaned
• 2 cloves of garlic
• 1 wedge of preserved lemon
• 2 cm red Spanish chilli pepper
• 1 bunch of flat-leaf parsley
• 1 sprig of tarragon
• 1 sprig of basil
• 100 ml olive oil
• 4 green olives, pitted
• 4 anchovy fillets
• 1 tbsp mustard
• 1 tbsp capers
• ½ tsp onion powder