I wanted to try out this recipe from a cookbook. The sponge dough takes 4-5 hours to ferment. After that you still need to add to more flour, yeast, sugar and other stuff to mix into the final dough. But I think it is worth the effort because the rolls came out very very soft. The smell of cinnamon baking in the oven is so nice. Sharing with you some pictures of how the cinnamon roll turned out. BTW, I managed to get three trays of cinnamon rolls with 1 recipe.
See how soft the inside is.