INGREDIENTS
15 g
unsalted butter, melted (for greasing the soufflé dish)
45 g
unsalted butter
60 g
plus 1 tablespoon) plain flour
450 milliliters
plus 2 teaspoons) full cream milk
240 g
Gruyère cheese, grated
3 tsp
Dijon mustard
sea salt & freshly ground white pepper
6
eggs, separated