Chocolate Marquise - G-Free Foodie

Ingredients

• 3 oz (85 grams/ 6 tablespoons) bittersweet chocolate (about 70% cocoa)
• ⅓ cup + 2 teaspoons (90 ml/3 fluid oz.) heavy cream
• ⅛ teaspoon salt
• 1 tablespoon (15 ml/ ½ fluid oz.) light corn syrup
• ¼ teaspoon vanilla
• ¼ oz unsalted butter (½ tablespoon/8 grams), softened
• 3 large egg yolks at room temperature
• 1 large egg
• 2 tablespoons + 2 teaspoons (40 ml) (40 grams/ 1½ oz) sugar
• 1 tablespoon + 1 teaspoon (⅔ fluid oz/ 20 ml.) water
• ½ cup (4 fluid oz./ 120 ml.) heavy cream