Lady Florence Bjelke-Petersen's Famous Pumpkin Scones

I've been wanting to try these for ages. Everyone in Australia will remember Joh & Flo

1 Tblsp butter
1/2 cup sugar
1/4 teaspoon salt
1 egg
1 cup mashed pumpkin (cold)
2 cups Self raising flour

Beat together butter, sugar and salt with electric mixer.
Add egg, then pumpkin and stir in the flour.
Turn on to floured board and cut.
Place in tray on top shelf of very hot oven 225-250C for 15-20 minutes.

Source: Lady Florence Bjelke-Petersen