Preheat the oven to 220°C/200°Fan/gas 7. Season the chicken thighs well and put in a casserole dish. Ideally they will just cover the base. Mix the tinned tomatoes, ketchup, soy sauce, mustard, Worcestershire sauce and sugar in a bowl and season well before spooning over the chicken. Season with black pepper and a little salt. Spoon over the chicken, coating evenly, and bake uncovered for 30 minutes until the meat is cooked through with no pink showing.
To make the mash, place all the ingredients into a blender and whizz until smooth and creamy. Transfer the mash to a small saucepan and stir over a low flame to heat before serving. Adjust for seasoning and divide the mash between two plates and spoon the devilled chicken on top of each.
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