Baileys Chocolate Mousse

Bahan-bahan (4 porsi)

• 3 ounces semisweet chocolate, (rough chopped)
• 1 tablespoon unsalted butter, (cut into 4 pieces)
• 1 pinch salt
• 2 tablespoons Baileys Irish Cream
• 2 large eggs, (separated)
• 1 tablespoon sugar
• ⅓ cup chilled heavy cream, (plus more for serving)