Mini Beef en Croutes

unsalted butter 43.0% , british beef 16.0% , mushroom 14.0% , water 7.0% , beef broth 7.0% , shallot 6.5% , red wine 3.3% , corn flour 1.6% , dried cep 0.8% , Madeira 0.4% , salt 0.2% , onion 0.1% , yeast extract 0.1% , garlic puree 0.0% , beef fat 0.0% , mushroom 0.0% , sugar 0.0% , tomato purée 0.0% , thyme 0.0% , demerara sugar 0.0% , cracked black pepper 0.0% , dried garlic 0.0% , caramelised sugar syrup 0.0% , flavouring 0.0% , bay leaf 0.0% , red currant juice 0.0% , black pepper 0.0% , dehydrated onion 0.0% , leek 0.0%