Ingredients 
    
    - 8 Lambs Kidneys Skins Removed & Cut In Half
 - 4 Slices Pancetta
 - 2 Tbsp. Flour
 - 25g Butter
 - 1 Onion Finely Diced
 - 1 Tbsp. Brown Sugar
 - 10ml Cider Vinegar
 - 1 Tbsp. Tomato Puree
 - 1 Tbsp. Hot Mustard
 - 1 Tbsp. hot mustard
 - 2 Tbsp. Worcestershire sauce
 - 4 Slices Of Crusty Bread
 - Butter For Toast
 - Small Bunch Of Chives Snipped
 - Maldon Salt And Freshly Ground Black Pepper
 
Method
- Remove kidneys from packaging and pat dry with kitchen paper, then slice in half removing any white core that's intact
 - Toss in the flour and season well with salt and pepper.
 - Melt the butter in a large non-stick frying pan, add the onion and sugar & sweat gently for 3-4 minutes, or until soft, sweet & tender & keep to one side.
 - Shake off any excess flour from the kidneys & saute them over a medium-high heat for 2-3 minutes then keep to one side.
 - Add the vinegar, tomato purée and mustard to the pan, then gradually add 250ml of light chicken stock or water, stirring constantly & bring to the boil; add the Worcestershire sauce to the pan and season with salt and freshly ground black pepper.
 - Reduce the heat and simmer gently for 5 minutes, then add the onions & kidneys to the sauce & simmer for a couple of minutes, at this point do not boil.
 - While the kidneys are cooking, grill the pancetta until nice and crisp then toast the bread and spread with butter and put on four warm plates.
 - Spoon the kidneys and sauce over the buttered toast and scatter with chopped chives, finish with crispy pancetta.