Start by mixing the butter and sugar together, but DO NOT CREAM them (see notes). The butter shouldn't be too soft, but also not straight from the fridge, especially if you use a mixer.
Add the lemon rind, and oil (if using.)
Add the flour and mix to a stiff consistency. Don't overwork the dough; stop as soon as it comes together.
Roll the dough (as with sugar cookies) and cut with desired cookie cutter(s). Place onto prepared baking sheet lined with parchment or silicone sheet, and prick evenly.
Place in a preheated oven for about 15 minutes, or until slightly brown on edges. Sprinkle with sugar immediately upon removing from the oven. Shortbread shouldn't be darkly colored. Let your lemon shortbread cool for a few minutes on the pan or tray before moving to rack to cool completely.
Video
Notes
Quality ingredients are KEY, especially the butter.
The butter and sugar should be thoroughly amalgamated, but not creamed (as when making a cake and the result becomes light and fluffy-shortbread dough takes only a few minutes to make.)
PLEASE USE A SCALE FOR BEST RESULTS. Visit my Kitchen Essentials shop to see how inexpensive they are.
If for some reason you don't use a scale and your mixture doesn't come together, press it into a pan or use to make a crumble topping - there is no reason to throw it away.
Store in a sealed container (an old Walker's tin is excellent) and keep in a cool, dry place. Shortbread will keep well for weeks, but is also excellent after being frozen.
If you plan to keep your shortbread for more than two weeks, I'd suggest freezing it. Visit my Scottish/British shop for lots of my favorite items!
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