Preheat oven to 160C. Line 2 trays with silicone paper.
Melt butter in microwave in 30 second increments until melted. Allow to cool slightly.
Combine flour, sugar, egg white and melted butter and mix until thoroughly combined.
Chill for 20 minutes.
Using a spatula spread the batter in long strokes to get even(ish) lines about 2cm wide and 30cm long. (I did 2 to a tray)
Sprinkle with the dried lavender flowers.
Bake for 10 – 15 minutes. Keep checking them after 10 minutes. They are ready when golden brown.
Working quickly, with a spatula, peel the biscuit off and shape around a rolling pin. Allow to cool and set.
Keep in an air tight container will last a few days.