Another Dutch baked goodie. It is similar to boterkoek, but the preparation is a bit different.
Sheet Cookie Bar
250 g butter
grated zest of 1 lemon
150 g sugar
pinch of salt
250 g flour
Preheat the oven to 200C. Prepare a 20x20cm baking tin (line with baking paper or grease).
Cream butter, lemon zest, sugar and salt together until almost white and very fluffy. Whisk the egg, add half to the buttercream and mix well. Add the flour and knead until smooth. Put in the prepared baking tin and flatten. Brush with the remaining egg. Place in the oven and bake for 25 minutes.
Leave to cool for 15 minutes in the tin, then take out, cut in pieces and leave to cool completely.