Pistachio Bread and Butter Pudding

The toasty top of a bread and butter pudding is the equivalent of a corner piece of brownie, or that craggy, cheese-crusted edge of lasagne. The crunchy corners of this one peek through a soft-baked pistachio custard like a shiver of sharks, fins exposed. Dust with icing (confectioners’) sugar and finish with crushed roasted pistachios. Dark chocolate (bittersweet) is optional, but highly recommended.