Nutella Babka

Name: Nutella Babka
Cook time: 7 h
Total time: 7 h
Cuisine: European, Eastern European
Ingredients: 4 1/4 cups all-purpose flour, plus extra for dusting; 1/2 cup granulated sugar; 2 tsp dry active yeast,; Grated zest of 1 small lemon; 3 large eggs; 1/2 c room temperature water, and up to 1 to 2 tablespoons extra, if needed; 1 tsp kosher salt; 2/3 cup unsalted butter at room temp; 1 1/2 c room temperature Nutella; Syrup: 1/3 cup water; 6 tablespoons granulated sugar; 2 tsp pure vanilla extract