Add lamb mince to a large bowl. Finely dice onion, mince garlic and finely chop rosemary leaves. Add this to mince.
Crumble in feta so no large chunks remain, add egg, breadcrumbs and seasonings. I like to use my hands to squeeze all of the ingredients together to mix. Do this until mince becomes sticky in texture, approximately five minutes.
Cut each square of puff pastry in half. Divide mince into six portions. Take one portion and mould into a log along pastry. Roll up pastry so that the seam is at the bottom. Divide each log in to four parts and place on prepared baking tray. Repeat with remaining mince.
Lightly whisk remaining egg for egg wash. Swipe across each roll and dust with remaining rosemary. Bake for 30 minutes until golden brown. Serve warm.
Notes
Fresh or dried rosemary can be used for this recipe. Personally I used fresh for the mince mixture and dried to sprinkle on top