Perfect roast chicken and peanut sauce

Ingredients

• 1 whole chicken, preferably free-range
• 2 teaspoon sea salt
• 1 lemon, quartered
• few sprigs fresh herbs (thyme, oregano or parsley are good)
• 2 - 4 tbsp olive oil
• 6 - 12 small lettuce leaves (baby cos or buttercrunch)
• 4 - 6 tomatoes, chopped
• peanut sauce (see below)
• cooked rice, to serve (optional)
• Peanut sauce
• 1 cup dry roasted peanuts
• 1/3 cup water
• 2 garlic cloves, minced
• 1/2 teaspoon dark soy sauce
• 2 teaspoon sesame oil
• 2 tablespoon brown sugar
• 2 tablespoon fish sauce
• 1/2 teaspoon tamarind purée
• 1 fresh chilli or ¼-½ teaspoon chilli powder (to taste)
• squeeze of fresh lime juice (about 1 tablespoon)
• salt to season
• extra water to thin sauce