This shortbread keeps very well in an airtight tin or tightly wrapped in tinfoil. The recipe is from Scotland.
I've made this recipe two times now. The first I followed the recipe exactly. The second time, I added all but 2 tbs of the sugar/spice mixture into the flour before mixing in the butter. I then sprinkled the 2 tbs on top after scoring the shortbread. I also baked in my brownie pan (9X10) instead of the 8X8 as suggested. Great recipe, great spice mixture. Don't omit the cardamon, even if you have to go out and buy some just for this recipe. It is a very fragrant spice and really adds to the taste. - 28 Jul 2008 (Review from Allrecipes USA and Canada)
This deserves a lot more reviews than it has received. It was really delicious and different, yet appealing to a wide variety of tastes. Everyone I served these to loved them. One thing I should note is that the mixture looks like sand when you press it into the pan, but will come together as it bakes, so don't worry. It's not too sweet and keeps well, so you can make it in advance. - 22 Aug 2007 (Review from Allrecipes USA and Canada)
We really liked these. They melt in your mouth! I didn't have any superfine sugar, but I whirled some regular sugar in my food processor, which did the trick. The flavor is very subtle, but letting the cookie dissolve in your mouth lets you get the full effect. Thank you for the recipe, Tech! I will add it to my collection. - 27 Jun 2009 (Review from Allrecipes USA and Canada)