Delightful, crispy, and buttery biscuit recipe. Fit for a king. Add the nuts of your choice. The original recipe actually requires almond essence. That, however, is an acquired taste. If you like the distinct taste of almond essence, go ahead and replace the vanilla. With most recipes, one may replace butter with margarine. However, when baking these Greek biscuits, I would not replace the butter. They are also called Greek butter cookies.