To make the dough; In a small bowl, mix yeast and sugar with a small amount of the water to activate the yeast.
Place flour, salt, butter, water and yeast mix into the Thermomix bowl and mix 6 sec/speed 6.
Knead 10 min/Interval.
Tip dough into a lightly greased large bowl. Cover and set aside for an hour.
To make the filling, place all ingredients into the Thermomix bowl. Combine 20 sec/speed 5.
On a floured bench, roll dough out into a large, thin rectangle. Spread filling all over, leaving a strip bare at the top of dough.
Roll up swiss roll style. When you get the the end, brush a small amount of water on the bare edge of dough and continue rolling to seal. Place seam side down.
Grease 2 x 12 hole muffin tins generously with soft butter. (We mean generous, no scrimping here!)
In a small bowl mix sugar, cinnamon, salt and orange zest together. Divide between muffin holes.
Using a serrated knife cut 1cm wide scrolls and place in the muffin tin. Cover and let rise till double in size.
Preheat oven to 200°C. Bake for 15 minutes. Tip out of trays immediately or you will find them difficult to get out when cold.
Serve hot, preferably with a morning beverage of your choice. They freeze really well. Then simply reheat in a hot oven until fragrant and voila, fresh buns all over again.