Combine flour with baking powder, bicarb, salt and nutmeg. In a clean 1 quart-sized jar with a wide mouth, layer sugar followed by flour mixture. Press firmly in place and seal. Attach a card with the following instructions:
Basic biscuits recipe
In a large bowl, beat 225g room-temperature butter until light and fluffy. Mix in 1 egg until combined. Add 125ml soured cream and 1 teaspoon vanilla extract and blend at low speed. Gradually add contents of jar and mix until fully incorporated. Wrap biscuit dough in cling film and chill for several hours or overnight.
Remove dough from the fridge. Preheat oven to 190 C / Gas mark 5.
Roll chilled dough out on a lightly floured surface and cut into desired shapes. Place on an ungreased baking tray and bake in the preheated oven until edges are golden brown, 10 to 12 minutes.
You can add a variety of additions to the dry mix in the jar to make your very own version of this recipe. Try 125g of chocolate chips; 150g currants; 100g chopped pistachios; 2 teaspoons ground cinnamon; or 2 teaspoons grated lemon zest.