If you will use chocolate, sprinkle the crust with
some good quality chocolate chips, and return to the oven for 3 - 4 minutes.
She suggested using
the best quality chocolate chips and that she'd heard Levain uses Guittard chocolate — so that is what I used — Guittard semi sweet chocolate chips.
You can also swap the sultanas for other dried fruit, or for nuts, seeds and / or cacao nibs or
good quality chocolate chips, if you prefer!