Preheat the oven to 180C/350F/Gas mark 4
Cut the dates into 1 cm pieces. Combine the sifted flour, sugar and wheatgerm in a bowl, rub in the butter. Add the sour cream and enough water to the make ingredients cling together. Add the dates. Knead gently on a lightly floured surface until the dates are well combined.
Roll the mixture into a log shape about 35cm long. Shape the log into a long triangle. Wrap in foil, refrigerate for 1 hour.
Remove foil from log, cut into 5mm slices. Place about 2cm apart onto greased baking trays. Bake for about 12 minutes, until well browned. Stand for 5 minutes before lifting onto wire racks to cool.
