Dark Chocolate Mousse for Two - I Quit Sugar

Ingredients

• 100g dark chocolate (75% cocoa or higher), finely chopped
• 1/2 cup heavy cream
• 1 tablespoon unsalted butter
• 2-3 tablespoons rice malt syrup (adjust to taste)
• 1/2 teaspoon pure vanilla extract
• 1 large egg, separated
• A pinch of salt
• For the Toppings:
• 1-2 tablespoons rice malt syrup (adjust to taste)
• 1/2 teaspoon vanilla extract
• 1/2 cup mixed berries (strawberries, raspberries, or your choice)
• A few squares of dark chocolate, shaved using a grater or vegetable peeler