Chocolate Babka

Bahan-bahan (1 porsi)

• 1/2 cup (1 stick) unsalted butter, melted and cooled slightly, plus more for greasing the pans
• ½ cup warm water
• ¼ cup sugar
• 1 ⅛ teaspoons salt
• 1 teaspoon rapid-rise/instant yeast
• 2 large eggs
• 1 large egg yolk
• 2¾ cups all-purpose flour, (spooned into measuring cup and leveled off, plus more for kneading and rolling)
• ½ cup Nutella or other chocolate hazelnut spread, (at room temperature)
• 3 oz bittersweet chocolate, (finely chopped (⅔ cup), best quality)
• ¼ cup water
• 6 tablespoons sugar
• Generous pinch salt