Cook the squash (in water) until tender (apprx 25 minutes), drain.
Puree in a food processor until smooth.
Blend in the butter, maple syrup, salt, pepper& nutmeg.
Spoon into a shallow lightly greased baking dish (8 cup size) serve immediately or You may now refrigerate the casserol covered for up to 2 days or freeze for up to 2 weeks If you freeze the caaserole thaw in the fridge for 3 days before planning to serve it.
Bake in 400F oven for 25 minutes Decorate with nuts and bake a further 10 minutes.