I used a pack of roasted mixed nuts, but hazelnuts would be just as good. Don't make them super fine, just nicely chopped.
Tasted OK but the pears didn't add anything. The toffee sauce boiled up and completely covered the crumble topping. Obviously that was then soft. Maybe it was something to do with my oven but I won't bother making this again. - 26 Apr 2017