Crumble the yeast in a bowl.
Heat up the milk in a casserole so it is finger warm approx 37 Celsius degree.
Pour the milk in the bowl with the yeast and stir it gently a few times. Let the yeast rest for 30 minutes in the bowl.
Start the oven at 30 degree Celsius.
Mix 1 pinch of sugar and 3 tablespoons of the flour in a small bowl and mix it.
Pour the flour and sugar mixture in the yeast bowl and mix it together.
Cover the bowl with a baking towel and let the mixture rest for 30 minutes in the oven.
Mix the rest of the flour, sugar and the salt in a bowl.
Make a litte hole in the middle of the flour mixture, and put the ckracked eggs in the hole. Stir the mixture together for approx 5 minutes to make a homogene dough.
Take out the yeast bowl from the oven and pour it in the dough bowl.
Add the butter in the bowl and work the dough until it is lump free and strechy.
Cover the bowl with the baking towel, and let it rest for 30 minutes.
Work the dough with some flour for 1 minute in the bowl.
Butter a round oven form, and put the dough in the form.
Let the dough rest for 30 minutes.
Preheat the oven at 180 degree Celsius.
Put the brioche in the lower part of the oven for 40 minutes.
Take out the brioche and let it cool down i room temperatue.