Lightly heat the QimiQ Sauce Base with the milk and sugar and whisk in the dried yeast.
Place the remaining ingredients into a mixing bowl. Add the QimiQ mixture and knead to a smooth dough. Cover and allow to rest in a warm place for approx. 80 minutes. (Tip: allow to rest in an oven at 120 °F.)
Create 3 strands with the dough and form a plait. Place onto a baking sheet lined with baking paper, cover and allow to proof for a further 25 minutes.
Preheat an oven to 350 °F (conventional oven).
Whisk an egg yolk and brush over the brioche. Bake in the preheated oven for approx. 25-30 minutes.