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Heat oven to 200C/fan 180C/gas 6. For the wedges, mix the flour, cayenne and herbs (if using), add some salt and pepper, then toss with the potatoes and oil until well coated. Tip into a roasting tin, then bake for about 35 mins until crisp and cooked through.
Meanwhile, heat the oil in a non-stick pan, then gently fry the onion and bacon together for 5-10 mins until the onions are softened and just starting to turn golden. Stir in the sugar, tomatoes, stock and seasoning to taste, then simmer the sauce for 5 mins. Add the beans, then simmer for another 5 mins until the sauce has thickened. Serve with the wedges.