A crisp yet crumbly chocolate shortbread crust filled with a layer of rich chocolate glaze and finished off with some chopped lightly salted roasted pistachios---an unbeatable combination for an unforgettable sweet treat!
- Preheat the oven to 160C/320F. Put the butter into a large mixing bowl, and beat with a wooden spoon until soft. Beat in the sugar and salt. Sift over the flour and cocoa powder and mix just until a dough forms.
- Divide the shortbread dough into four portions and press each in an even layer onto the bottom of four 12cm/4inch tart pans or one 26cm/10inch. Bake for about 20 minutes, or just until the they are firm to the touch.
- Meanwhile, melt the chopped chocolate, maple syrup, butter and heavy cream in a stainless steel bowl set over a saucepan of simmering water. Mix until smooth.
- Remove the shortbread from the oven and pour the warm chocolate glaze over the shortbread crusts and evenly spread the surface. Sprinkle the chopped pistachios or caramelized walnuts. They can be stored in container at room temperature for a few days.