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1
Bring water, milk, butter and salt to rolling boil; remove from heat, fold in flour until glossy dough forms.
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2
Incorporate eggs one at a time, beating vigorously until batter is smooth and pipeable.
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3
Pipe 2cm mounds onto parchment-lined baking sheet; bake at 200°C for 25 minutes until puffed and golden, cool on rack.
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4
Whisk egg yolks with caster sugar until pale; sift cornstarch over and whisk in. Heat milk with vanilla pod and seeds to just below boil; temper yolks by whisking in hot milk slowly.
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5
Return mixture to saucepan, cook over medium heat stirring constantly for 3 minutes until thick and glossy; finish with butter, cool completely.
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6
Slice each profiterole horizontally, pipe crème pâtissière into cavity using pastry bag, replace top.
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7
Melt dark chocolate with cream and butter over bain-marie; dip profiterole tops into warm glaze, set on parchment to set.