Calves Liver with Onion Gravy and Mash - James Martin Chef

Ingredients

• 4 Calves livers, sliced into 1cm thick slices
• 1 tbsp plain flour
• 400ml beef stock
• 50ml Madeira
• 1 tsp sherry vinegar
• 25g butter
• 2 shallots, peeled and sliced thinly
• 1 tbsp veg oil
• 1 kg mash potato
• 50g butter
• 50ml double cream
• Salt and pepper, to taste
• Deep fried sage leaves
• ½ onion, cut into rings
• 150ml milk
• 100g plain flour