Preheat the oven to 300 degrees F.
In a small saucepan, combine the cream, 1 tablespoon of the sugar, the vanilla bean pod and reserved seeds, and salt and bring just to a boil over medium heat. Remove from the heat and set aside. Remove and discard the vanilla bean pods. Stir in the Grand Marnier and orange zest.
In a small bowl, combine the egg yolks and 2 teaspoons of the sugar and whisk until frothy and the sugar is dissolved. Slowly whisk in the cream mixture. Divide between 2 (6-ounce) ramekins. Place in a small roasting pan or baking dish and fill with enough water to come about halfway up the sides of the ramekins. Bake until the custards are just set and still tremble slightly in the center, 35 to 40 minutes.
Remove from the oven and let cool. Cover with plastic wrap and refrigerate until well chilled, at least 4 hours.
Preheat the broiler. Sprinkle the top of each custard with 1/2 teaspoon of the remaining sugar. Place under the broiler and broil until sugar melts and caramelizes, 1 to 2 minutes, watching closely to avoid burning and turning the custards as they cook. (Alternatively, use a kitchen blow torch to caramelize the sugar.)
Stick the sharp ends of the shards down into each custard, garnish with mint, and serve immediately.
Yield: 2 servings