happen if you are in a dry environment where the flour is very dry; then it might need more hydration than usual The dough should start coming together after a full minute of mixing on medium speed Watch carefully and add liquid if necessary Unattended stollen dough that is very dry in the early stages of the mixing will have lumps that will be impossible to get rid of later on Mix the dough for 5 minutes on medium speed and stop the machine Using a rubber spatula or a dough scraper, scrape the dough that is stuck to the bottom and sides of the bowl If the dough seems very wet and loose, add a tiny amount of all-purpose flour to it Mix again for 5 minutes, stop and scrape the bowl and dough hook, and repeat once more Depending on the amount of dough, after about 15 minutes of mixing the dough you should hear a slapping sound and the dough should be very elastic and completely wrapped around the hook It should now look shiny and you should be able to stretch out a small piece of it like a piece of cloth; this technique is called windowpane (SEE PHOTO) Add half of the soft butter to the dough and mix on low to incorporate it, about 2 minutes At the beginning it will look like the butter will not incorporate, but eventually it will After 2 minutes, stop the machine and scrape the butter together with the dough with a rubber spatula, then mix for another 2 minutes Eventually it will all be absorbed Add the remaining soft butter and repeat this mixing procedure at medium ... able to stretch out a small piece of it like a piece of cloth; this technique is called windowpane (SEE PHOTO) Add half of the soft butter to the dough and mix on low to incorporate it, about 2 minutes At the beginning it will look like... beginning it will look like the butter will not incorporate, but eventually it will After 2 minutes, stop the machine and scrape the butter together with the dough with a rubber spatula, then mix for another 2 minutes... that is stuck to the bottom and sides of the bowl If the dough seems very wet and loose, add a tiny amount of all-purpose flour to it Mix again for 5 minutes, stop and scrape the bowl and dough hook,