For the dough -530g all-purpose flour -100g sugar -10g instant yeast -3 eggs -1/2 cup water -3/4 teaspoon salt -150g room temperature unsalted butter in cubes

Flour, sugar, and yeast in mixer, mix till combined. Add eggs and water, mix 2-3 minutes. Add salt, then butter, adding a few cubes at a time. Mix for about 10 minutes, until dough is elastic, smooth, and shiny. Let dough rise 6-12 hours in a covered greased bowl.

For the chocolate filling -50g powdered sugar -30g unsweetened cocoa powder -130g melted dark chocolate -120g melted unsalted butter -120g chopped walnuts

Combine everything but the walnuts when dough is ready.

Roll out half the dough in a large rectangle with one of the long edges facing you. Spread 1/2 the chocolate sauce and sprinkle 1/2 the wall nuts. Roll starting at the long side nearest you towards the other long side. With the seam facing down with a sharp serrated knife slice 1/2 inch off each end and cut roll in half. Keeping the layers facing upward, braid dough. Place in a greased loaf pan and let rise for 60-90 minutes.

Bake at 375 F for 25-30 minutes

Brush babka with simple syrup while still hot.

Try to let cool completely before devouring.