Shepherd's pie

INGREDIENTS

• 2 onions
• 2 carrots
• 2 sticks celery
• 2 garlic
• 4 tbsp rapeseed oilolive oil
• 450g/1lb leftover roast lamb
• 1 tbsp plain flour
• 150ml/5fl oz red wine
• 1 tsp fresh thyme
• 4 tsp Worcestershire sauce
• 1 tsp anchovy essence
• 1 tsp mushroom ketchup
• 1-2 tsp redcurrant jelly
• 1 x 400g/14oz can chopped tomatoes
• 300ml/10½fl oz lamb stock
• and freshly ground saltblack pepper
• 750g/1½lb floury potatoes
• 50ml/2fl oz milk
• 50g/2oz butter