Season the steaks with salt. Heat the oil in a frying pan large enough to fit both steaks, then add half the butter and once melted and foaming, add the garlic and thyme. Carefully put the steak in the pan and cook for 3 mins for rare, 4 mins for medium and 6 mins for well done, flip the steak and repeat. Once cooked, add a squeeze of lemon juice to the pan and spoon the lemony butter over the steak. Transfer the steaks to a warm plate and cover.

Pour off the fat from the pan, discard the garlic and thyme and wipe out with kitchen paper. Place the pan back on the heat, add half the remaining butter, and once melted, add the shallot and fry for 30 seconds, then add the wine and reduce to a glaze. Pour in the stock and bring up to the boil, then add the pastrami and chilli and warm through. Finally, stir in the parsley. Put the steaks on plates and spoon over the sauce, with the ketchup (see recipe below) and chips on the side.