Ukrainian Easter Bread

Ingredients

• 2 packages active dry yeast
• 12 cups plus 1 tablespoon sifted all-purpose flour
• 2/3 cup plus 1 tablespoon sugar
• 2 to 3 tablespoons warm water, 100 degrees to 110 degrees
• 2 cups warm milk, 100 degrees to 110 degrees
• 6 large eggs, 3 whole, 3 separated, room temperature
• 8 large egg yolks, room temperature
• 1/4 teaspoon salt
• 1 teaspoon pure vanilla extract
• zest of 1 lemon
• zest of 1 orange
• 3 tablespoons rum or brandy
• 8 tablespoons (1 stick) unsalted butter, melted, plus more for pans
• 1/2 cup vegetable oil