Ingredients

• 3 tablespoons butter
• 8 brioche-style hamburger buns
• 1 teaspoon sesame seeds

Instructions

1. 1 Butter a 9x12-inch or 9x13-inch baking dish with 3 tablespoons butter and set aside. If buns are not already stale and relatively dry, split them open and spread out on a baking sheet. Bake at 250 degrees F (120 degrees C) until very lightly toasted, about 20 minutes. Let cool.
2. 2 For custard batter, combine eggs, white sugar, whiskey, vanilla, cinnamon, salt, milk, cream, ketchup, mustard, and mayonnaise in a bowl; whisk to combine.
3. 3 Lay 6 bun bottoms into the prepared baking dish. Break last 2 bun bottoms and 1/2 of a top bun into large pieces and use pieces to fill in the gaps.
4. 4 Ladle half of custard mixture over buns. Place 6 bun tops over bottom layer and use the last 1 1/2 top buns to fill in the center gap. Ladle remaining custard mixture over. Wrap and refrigerate for at least 3 hours or preferably up to 12 hours.
5. 5 Preheat the oven to 350 degrees F (175 degrees C). Brush the tops of buns with some of the custard mixture and sprinkle with sesame seeds.
6. 6 Bake in the preheated oven until buns are browned and puffed up, about 1 hour. Remove to cool on a wire rack.
7. 7 For whiskey sauce, add butter, whiskey, brown sugar, water, and a pinch of salt to a small saucepan and bring to a boil over medium-high heat. Turn off heat and let cool before using. Sauce will thicken as it cools.

Nutrition per serving