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 heatproof bowl over simmering water, stirring until smooth. Cool slightly.
03 - Whisk egg yolks, 1.75 oz sugar, vanilla, and salt until pale. Stir in melted chocolate and flour.
04 - Beat egg whites to soft peaks. Gradually add pinch of sugar, beating to stiff glossy peaks.
05 - Fold one-third whites into chocolate to lighten. Gently fold remaining whites, maintaining air volume.
06 - Spoon batter into ramekins, smoothing tops. Run thumb around inside rim for even rising.
07 - Bake 16-18 minutes until well risen with slight wobble in center.
08 - Heat milk, cream, and vanilla bean to just below simmering.
09 - Whisk yolks and 2.1 oz sugar until pale. Gradually whisk in hot milk mixture.
10 - Return to saucepan, cook over low heat stirring constantly until thickened enough to coat spoon. Strain.
11 - Serve soufflés immediately with crème anglaise poured over or alongside.