Chocolate-Whiskey Souffle Tarts

Ingredients

• 1 1/2 cups all purpose flour
• 3/4 cup (1 1/2 sticks) chilled unsalted butter, cut into small pieces
• 3/4 cup powdered sugar
• 1/2 teaspoon (scant) salt
• 10 ounces bittersweet (not unsweetened) or semisweet chocolate, chopped
• 1 cup irish whiskey
• 1 1/2 teaspoons vanilla extract
• 1 1/4 teaspoons instant coffee crystals
• pinch of salt
• 4 large eggs, separated
• 1/2 cup sugar
• sweetened whipped cream
• chocolate shavings (optional)