S'mores Chocolate Mousse

Bahan-bahan (6 porsi)

• 4 large egg yolks
• 1/4 cup (50g) granulated sugar
• 1/8 teaspoon salt
• 2 cups (480ml) heavy cream, divided
• 1 teaspoon pure vanilla extract
• two 4 ounce semi-sweet chocolate bars (226g), finely chopped*
• 1 cup (100g) graham cracker crumbs (about 8 graham crackers)
• 4 large egg whites
• 1 cup (200g) granulated sugar
• 1/2 teaspoon cream of tartar
• 1/2 teaspoon pure vanilla extract