500g/1lb 2oz baby potatoes
100ml/3陆fl oz chicken stock
1 tbsp plain flour
1 bay leaf
200ml/7fl oz beef stock
black pepper, to taste
50ml/2fl oz malt vinegar
10g/1/3oz unsalted butter
4 slices smoked streaky bacon
1 tbsp pork fat
150驳/5陆辞锄 curd cheese or hard mozzarella