Shortbread

A very basic family heirloom recipe. It's in two versions, one with outs and one without
Quantities are for one 20cm × 30cm baking tray.
No oatsOaty
250g250gButter at room temperature
120g120gSoft light brown sugar
Grated rind of one lemon
300g220gSelf raising flour
1/2 tsp1/2 tspPowdered ginger (optional)
120gFine rolled oats
60g60gCoarse semolina or ground rice
Pre-heat the oven to 150°C/300°F/Gas mark 2. Grease the baking tin
Beat together the butter sugar and lemon rind until smooth. Add the other ingredients and mix well. Spread smoothly over the baking tray and prick all over with a fork. Bake for 45—50min.
Allow to cool for 10—15 minutes then cut into elongated rectangles. Remove from tray when cold.
Can we add something to shortbread