At a glance
You're making from-scratch sweet buns and a rich vanilla custard from egg yolks — both totally doable and way better than store-bought shortcuts. The buns need two rises to get wonderfully fluffy, while the custard requires careful whisking over a water bath to keep those egg yolks silky smooth without curdling.
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Make the starter
Combine the lukewarm milk, a pinch of sugar and the yeast to make a starter.
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First rise
In a bowl, mix the flour, starter, egg yolk and a pinch of salt. Dust with a little flour and leave in a warm spot to rise.
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Fold and rise again
Stir the dough through once more and let it rise a second time (this makes it even fluffier).