Tarta de galletas, mousse de chocolate y natillas
bittersweet or semisweet chocolate (400 grams), cocoa percentage to taste • heavy cream (200 ml) • large egg whites • large egg yolks • whole milk (300 ml) • heavy cream (200 ml) • cornstarch (20 grams) • sugar (60 grams) • vanilla sugar (or 2 teaspoons vanilla extract) • Lemon peel • cinnamon stick • tea biscuits or similar cookies (shape of your choice) •