Lincolnshire sausage & lentil simmer

INGREDIENTS

• 1 tbsp vegetable oil
• 130g packet cubed pancetta or dried bacon
• 2 packets Lincolnshire pork , or other good sausages
• 2 onions , roughly chopped
• 1 large carrot , chopped into small pieces
• 4 garlic cloves , roughly chopped
• 3 sprigs fresh rosemary
• 300g Puy lentils
• 850ml/1½pts hot chicken stock
• 1 tbsp white wine vinegar
• 400g can chopped tomatoes
• 2 tbsp chopped flatleaf parsley
• green winter salad with a mustardy dressing, to serve