160g/5陆oz cooked carrots, roughly chopped
160g/5陆oz button mushrooms, halved
1 roasted onion, thickly sliced
1 tsp roughly chopped flatleaf parsley
200ml/7fl oz leftover chicken gravy
1 tbsp grainy mustard
125g/4陆oz leftover roast chicken, torn into strips (darker meat, if possible)
300g/10陆oz leftover roast potatoes, thickly sliced