The ultimate 11s grouse sandwich
By Tom Kitchin From Saturday Kitchen Ingredients For the watercress mayonnaise 2 free-range egg yolks, at room temperature 1 tsp Dijon mustard 25ml/1fl oz white wine vinegar 250ml/9fl oz sunflower oil or vegetable oil squeeze lemon, plus extra, if needed 100g/3½oz watercress sprigs, rinsed …