Slow Cooked Beef In Peppercorn Sauce

400ge beef brisket (62%), peppercorn sauce (30%) (water, single cream (milk), white onion, modified maize starch, brandy, beef stock (water, yeast extract, beef powder, salt, sugar, beef fat, concentrated lemon juice, sunflower oil), salted butter (cream (milk), salt), peppercorns, brine (water, salt, acetic acid), dijon mustard (water, mustard seed, spirit vinegar, salt), black pepper, salt, colour (plain caramel)), water, modified maize starch, beef stock (water, yeast extract, beef powder, salt, sugar, beef fat, concentrated lemon juice, sunflower oil), colour (plain caramel), salt.