Comforting Cottage Pie

Serves 4 Ingredients : 2 teaspoons rapeseed oil Half of an onion finely chopped 1 large carrot diced 1 celery stick chopped  (optional) 400g (5% fat) lean minced beef 1 tablespoon plain flour 2 teaspoons sugar 100ml red wine 2 teaspoons tomato puree 2 teaspoons Worcestershire sauce 1 tin chopped tomatoes Pinch dried thyme (optional)…