Homemade Chocolate Mousse

Bahan-bahan (4 porsi)

• 8 ounces (226g) semi-sweet chocolate, finely chopped (two 4-ounce bars)
• 2/3 cup (160g/ml) heavy cream
• 4 large egg whites* (120g)
• 1/2 cup (100g) granulated sugar
• 1/4 teaspoon cream of tartar
• pinch of salt