Salted Chocolate Tart

Name: Salted Chocolate Tart
Ingredients: 2 (154-gram/5 1/2-ounce) packets Oreo cookies (28 biscuits in all); 50 grams (1 3/4 ounces) dark chocolate (minimum 70 percent cocoa solids); 50 grams (1 3/4 ounces) soft unsalted butter; 1/2 teaspoon smoked flaked sea salt; 100 grams (3 1/2 grams) dark chocolate (minimum 70 percent cocoa solids); 25 grams (1 ounce) corn starch; 60 milliliters (1/4 cup) full-fat milk; 500 milliliters (2 cups) double cream (or heavy cream); 50 grams (1 3/4 ounces) cocoa, sieved; 2 teaspoons instant espresso powder or strong instant coffee powder; 75 grams (2 1/2 ounces) superfine sugar; 1 teaspoon vanilla bean paste or 1 teaspoon vanilla extract; 2 teaspoons extra-virgin olive oil; 3/4 teaspoon smoked sea salt flakes