For the marinade, preheat the oven to 180C/Gas4. Split the chillies lengthways and place in a small roasting tray with the garlic and olive oil. Cook in the oven for 10 mins. Leave to cool for a few mins, then put the chillies, garlic and oil in a small food processor or blender and add the rest of the ingredients. Blend to a smooth purée. Transfer to a clean jar, seal and keep refrigerated.
For the honey mustard glaze Stir all the ingredients together in a small bowl and brush over grilled meat to glaze it.
For the chicken Trim any excess fat off the meat. Place in a bowl, add the marinade and toss to coat evenly. Cover the bowl with cling film and chill for at least 4 hours, preferably overnight. Set oven grill to medium heat. Trim and de-seed the pepper then cut into 2-3cm thick strips. Thread peppers and chicken thighs alternately onto 4-5 metal skewers. Season then grill or barbecue for about 10-12 mins, turning occasionally. Baste chicken with the honey glaze and return to the heat for a few more mins until golden brown and cooked through. Leave to rest for a few mins. Serve hot.
Recipe by appetite magazine at https://www.appetitemag.co.uk/spicy-malagueta-chicken/