If you're feeling particularly seasonal, this 'pumpkin pie' recipe from children's dietitian ... which substitutes pumpkin for butternut squash (which is easier to come by pre-Halloween), below ...
Pumpkins and squash are great in tarts. It's that mixture of the sweet and the salty in savoury pumpkin pies that really gets me. I like to use Crown Prince for this (a grey-green coloured pumpkin ...