Rough chop the cranberries and set aside.

Cream the butter, sugar, and zest together until well combined.

Add the flour and extract, and pulse about 10 times, then run the machine briefly, just until the dough comes together into a lump or lumps.

Add the cranberries and pulse just until they are distributed, but don't process too much.

Turn the dough out onto a lightly floured board and bring together with your hands.

Form the dough into a 10-12 inch log and wrap the log in plastic.

Chill the dough for at least 3 hours, or overnight.

Preheat the oven to 350F and line a cookie sheet with parchment paper.

Slice the dough into ⅓ inch slices and place on the cookie sheet, two inches apart.

Bake for 10-12 minutes, or slightly longer if you like your cookies crisper.

Let them cool for a couple of minutes on the baking sheets and then transfer them to a cooling rack.