Combine the water, yeast and 1 teaspoon of sugar in the bowl of a stand mixer and set aside for around 5 minutes to dissolve and become frothy.
Add the rest of the ingredients to the bowl, but only 3 of the 4 cups of flour. Fit a paddle attachment and lightly mix until just combined.
Change to a dough hook attachment and mix. While this is going, slowly add the remaining 1 cup of flour, and continue to mix until you have a smooth dough, about 5 minutes.
Shape the dough into a large ball and grease the mixing bowl with butter. Roll the ball in the butter to coat all sides.
Place the ball in the greased bowl, cover it with plastic cling wrap and set aside in a draft-free, warm area to rise for about 1 – 2 hours. You want it to double in size. If it is cool, this could take up to 4 hours.
Tip the dough onto a floured surface and roll it into a rectangular shape about 45cm long and 30cm wide.
Brush / spread the softened butter over the entire surface and sprinkle the sugar and cinnamon filling evenly over this.
Scatter the raisins over the sugar.
Starting from the longest edge, roll the dough up until you have a long log. Keep the join seam underneath.
Trim the edges of the roll and then cut it into 16 even pieces.