Start by letting the raisins soak in water, this will make them a bit juicier. Let them rest for 20 minutes or so.
Find a large table surface in your kitchen and get you overnight sweet dough, custard, sugar, cinnamon, and the raisins. Take a rolling pin and make a large rectangle of the whole dough. Try to get it down to 5 mm thick.
Add the custard, use the back of a spoon to smear it out over the whole surface.
Spread the cinnamon over the surface through a strainer and drizzle raisins and sugar on top.
Now you are ready to start cutting but first, bring out a bread form and butter it up on the inside.
Grab a knife and start cutting your rectangle into stripes along the short side of the rectangle. Try to get the strips as wide as the bread form is tall.
Then try the best you can to stack all the stripes on top of each other.
When you have a stack of strips start dividing it into square pieces.
Then stack the square "Sandwiches" up against each other inside the bred form, in such a way that you are able to see the layers from the top. Perfect!
Now if you're like me your kitchen will pretty messy, so cover your bedform with a plastic bag, and start cleaning.
Set the oven at 180 degrees Celsius
Let the dough get a total of 1,5 half hours of second proofing before you bake it, for about 30 to 35 minutes
Leave to cool, this is optional
Mix the icing sugar with water until you get a "runny" viscosity, and sprinkle it on top of the cake.