The best chocolate BABKA 

Dough ingredients:
550 g flour 12 % P
5 M eggs
100 g sugar
170 g butter 82 %
80 ml of warm milk
20 g fresh yeast
vanilla extract
6 g salt
grated lemon zest
+ orange
Ingredients stuffing
100 g farin sugar
100 g milk chocolate
50 g bitter chocolate 70%
140 g butter 82 %
30 g cocoa
Ingredients syrup :
120 ml water
70 g sugar
20 ml cognac
peel from an orange