finely chop the onion (½ onion) and crush the garlic (1 clove).
Heat half of the olive oil (½ tbsp) in a saucepan and add the chopped onion. Cook on a low heat for 5 minutes, stirring occasionally to prevent it burning.
After 5 minutes, add the garlic, chopped tomatoes (400g can), Worcestershire sauce (2 tbsp), white wine vinegar (1½ tbsp) and soft brown sugar (1 tbsp) and cook on a low heat for about 20 minutes until all of the liquid has reduced, stirring occasionally to prevent burning. Season with salt and pepper.
While the sauce is reducing, pre-heat the oven to 220°C/200°C fan. Place two baking trays to heat in the oven.
While the sauce is reducing you'll also need to cook the chicken and bacon (unless already cooked). Cut the chicken (1 breast) and bacon (4 rashers) into bitesized pieces.
Heat the remaining olive oil (½ tbsp) in a frying pan and add the chicken. Brown for a minute and then add the bacon. Cook the chicken and bacon for a further 5 minutes until cooked through.