Genevieve Taylor's Vietnamese Grilled Chicken Baguette with Mango & Lime Leaf Butter

Ingredients

• 700g chicken thigh fillets
• 1 lime, juiced
• 1 tbsp fish sauce
• 1 banana shallot, finely chopped (or 2 regular)
• 2 cloves garlic, crushed
• 2 tsp brown sugar
• 2 birds eye chillies, chopped
• 1/2 tsp Chinese five spice
• 1 tbsp vegetable oil
• salt and freshly ground black pepper
• 75g unsalted butter, softened
• 6 fresh kaffir lime leaves, finely chopped
• a good pinch sea salt flakes
• 4 x mini baguettes, or a large on cut into pieces
• a handful of soft lettuce leaves
• 1 slightly underripe mango, sliced