squeeze of lemon juice
1kg/2lb 4oz chipping potatoes
1 small shallot, finely chopped
1 large sprig of tarragon, bruised
3 tbsp tarragon leaves, finely chopped
½ tsp black peppercorns
flaky sea salt and freshly ground black pepper
groundnut or sunflower oil, for deep frying
freshly ground white pepper
50ml/2fl oz white wine vinegar
200g/7oz unsalted butter, cubed and softened
3 free-range egg yolks
2 x 200g/7oz sirloin or rib eye steaks, about 2cm/¾in thick, at room temperature