Slow Cooked Beef In Peppercorn Sauce

400ge beef brisket 62.0% , peppercorn sauce 30.0% , water 4.2% , single cream 1.9% , white onion 0.9% , modified corn starch 0.5% , brandy 0.2% , beef broth 0.1% , salted butter 0.1% , peppercorns 0.0% , brine 0.0% , dijon mustard 0.0% , black pepper 0.0% , salt 0.0% , Colour 0.0% , water 0.0% , modified corn starch 0.0% , beef broth 0.0% , Colour 0.0% , salt 0.0%