Gingerbread Orange Brioche Buns

Ingredients

• 1/2 cup whole milk (room temperature)
• 2 (0.25oz each) packages (14g) or 4 1/2 teaspoons Platinum Yeast
• 2 tablespoons granulated sugar
• 1/2 cup bread flour
• 1/3 cup unsulfured black-strap molasses
• 3 tablespoons light brown sugar, packed
• 2 1/2 tablespoons gingerbread spice
• 4 cups bread flour
• 2 teaspoons table salt
• 6 large eggs (slightly beaten)
• 9 ounces unsalted butter (softened but still cool)
• 3 tablespoons unsalted butter (room temperature)
• 1 cup sugar
• Zest of 1 orange
• 2 cups powdered sugar
• Zest of one orange
• 3 tablespoons fresh orange juice