01 - Preheat oven to 400°F. Generously butter four 7 oz ramekins and dust with sugar, tapping out excess.
02 - Melt chocolate and butter in a heatproof bowl over simmering water (double boiler), stirring until smooth. Cool slightly.
03 - Whisk egg yolks, 3 tbsp sugar, vanilla, and salt until pale and creamy. Fold in melted chocolate and flour until combined.
04 - Beat egg whites in a clean, dry bowl until soft peaks form. Gradually add pinch of sugar, beating until stiff glossy peaks form.
05 - Gently fold one-third of whites into chocolate to lighten. Fold in remaining whites carefully. Spoon into ramekins, smooth tops, and run thumb around inside rim.
06 - Bake 16–18 minutes until well risen with slight wobble in center.
07 - Heat milk, cream, and vanilla bean (or extract) in saucepan over medium heat until just below simmering.
08 - Whisk yolks and sugar until pale. Gradually whisk hot milk into yolks. Return to pan, cook over low heat stirring constantly until thick enough to coat spoon. Strain.
09 - Serve soufflés straight from oven with warm crème anglaise poured over or alongside.