4 Ingredient Chocolate Mousse

Name: 4-Ingredient Chocolate Mousse
Prep time: 20 min
Cook time: 35 min
Total time: 55 min
Yield: 4
Ingredients: 160g good-quality dark chocolate, minimum 64% cocoa solids; 4 organic free-range eggs, separated; 50g caster sugar, divided; Creme fraiche for serving