Triple Chocolate Tart With Boozy Whipped Cream

Ingredients

• 1/2 cup unsalted roasted almonds
• 15 chocolate wafer cookies (such as famous chocolate wafers; 4 ounces)
• 2 tablespoons packed light brown sugar
• 5 tablespoons unsalted butter, melted
• 1 cup whole milk
• 1/2 cup heavy cream
• 1/2 cup chocolate stout, preferably double chocolate stout (to measure, tilt cup and pour it slowly down side of a liquid measuring cup, then let foam dissipate or skim it off)
• 2 tablespoons packed light brown sugar
• 2 tablespoons unsweetened cocoa powder
• 2 tablespoons cornstarch
• 2 ounces good-quality bittersweet chocolate (60 - 62% cacao), finely chopped
• 1/2 teaspoon pure vanilla extract
• 1 cup chilled heavy cream
• 2 tablespoons bourbon
• 2 teaspoons sugar
• 1/4 teaspoon pure vanilla extract
• 9-inch tart pan (1-inch deep with removable bottom) or 9-inch springform pan
• chocolate shavings or cocoa powder, optional