Orange and Lemon Barbecue Sauce

• 1 medium-sized onion
• 1 oz (25 g) butter
• 2

Peel and finely chop the onion. Melt the butter in a saucepan over low heat, add the onion and cook gently for 10 minutes until tender and golden.

Put the soft brown sugar, cornflour, mustard and Worcestershire sauce into a mixing bowl. Add the finely grated orange rind, orange juice, lemon juice, tomato purée and water and season with salt and pepper. Mix together and add to the pan. B