Mix the butter, lemon juice and brown sugar together.
Spread the filling evenly across the dough with a knife (there will not be enough to fill every inch of the dough but you don't need it to).
Sprinkle the sultanas over the dough.
With the shorter side in front of you carefully roll the dough, making sure you pull it tight as you go.
Using a sharp knife, cut the dough roll into slices (you should get 12 buns, depending on how big your slices are).
Pinch any edges together and use your hands to shape them into circles (they will already be round, but might need a little more shaping).
Place them on the baking tray or in a dish quite close together.
Cover and let rest for around 20-30 minutes.
Pre-heat the oven to 200℃ / 400℉.
Bake in the oven for around 20-22 minutes. Make sure they are cooked but don't over-bake them.
Remove from the oven and allow to cool a little.
While still warm, brush over the syrup or honey. Enjoy!