With an electric mixer in a mixer bowl, cream the butter at medium-high speed until very pale in color. Add the sugar gradually and keep mixing until there's no grittiness.
Add the egg and flour and blend on medium-low speed. Add almond extract and mix until it disappears.
With a wooden spoon, mix nuts in and roll into a cylinder. Wrap in aluminum foil and freeze for three hours.
Slice into pieces about a half-inch thick. Serve two per person.
