Salted Chocolate Tarts for World Nutella Day - Shikha la mode

Ingredients

• 490 grams all-purpose flour
• 60 grams extra-dark cocoa powder
• 240 grams powdered sugar
• 250 grams butter, room temperature
• 2 1/2 grams salt
• 75 grams eggs, whole
• 85 grams egg yolks
• 2 tablespoons cornstarch
• 2 cups heavy cream
• 225 grams Nutella
• 1 pinch of salt
• 1 teaspoon vanilla extract
• 1 pinch sea salt, to garnish