Recipe: Polish Easter Babka

Name: Recipe: Polish Easter Babka
Ingredients: 6 tablespoons (3 ounces) unsalted butter, cut into 6 pieces; 1/2 cup heavy cream; Finely grated zest from 2 medium lemons (2 to 2 1/2 tablespoons); 1 1/2 teaspoons pure vanilla extract; 3/4 cup bread flour; 1/2 cup lukewarm water; 1 (1/4-ounce) package active dry yeast (2 1/4 teaspoons); 1 cup plus 2 tablespoons all-purpose flour; 1/3 cup granulated sugar; 3/4 teaspoon salt; 1 large egg, at room temperature; 2 large egg yolks, at room temperature; 1 1/4 cups raisins, sultanas, or currants; 1/4 cup toasted, slivered almonds or chopped walnuts (optional); Cooking spray; 1 1/4 cups powdered sugar; 2 tablespoons freshly squeezed lemon juice (from 1 medium lemon)