S'mores Tartlets

Bahan-bahan (8 porsi)

• 1 and 1/2 cups (180g) graham cracker crumbs (about 12 full sheet graham crackers)
• 6 Tablespoons (85g) unsalted butter, melted
• 1/4 cup (50g) granulated sugar
• 12 ounces (339g) semi-sweet chocolate, coarsely chopped
• 1/4 cup (4 Tbsp; 56g) unsalted butter, cubed
• 1 cup (240ml) heavy cream or heavy whipping cream
• 2 large egg whites, at room temperature
• 1/2 cup (100g) granulated sugar
• 1/8 teaspoon cream of tartar*
• 1 teaspoon pure vanilla extract