Ginger Spice Bread Pudding

Name: Ginger Spice Bread Pudding
Ingredients: 11 cups 3/4-inch cubes challah bread; 1 quart half-and-half; 4 tablespoons unsalted butter, divided; 1/2 cup strong coffee; 1/4 cup dark rum; 9 large egg yolks; 1/3 cup plus 3 Tablespoons granulated sugar, divided; 1/2 cup Grandma's molasses or equivalent; 3/4 teaspoon table salt; 2 & 1/2 teaspoons ground ginger, divided; 1 & 1/2 teaspoons cinnamon; 1/2 teaspoon nutmeg, freshly grated if possible; 1/2 teaspoon allspice; 1/4 teaspoon cloves; 1/8 teaspoon white pepper (optional); 2 teaspoons freshly grated orange zest