Process:

Cook the sausage on skillet/pan for about 8-10 minutes. In a separate pan melt 1 tbsp. of butter, and then add the sliced shallots. Let it caramelize on low heat. While stovetop items are cooking, cut pretzel bread without completely separating, and heat for 2-3 minutes in oven. When sausage is ready, assembly can begin. Slather dijon mustard on both sides of the pretzel. Then liberally line the insides with cheese, and add some arugula. Next, place half of caramelized onions, and a layer of sauerkraut. Finally, add the sausage. Then, put your sandwich in the oven for 5 minutes to melt the cheese and fuse all the flavors together. For the finishing touches, top it off with the remaining shallots, and a heaping spoonful of sauerkraut.

Thanks for stopping by!
Cheers, @shalala

_{*All content by me | Photos taken with Samsung Galaxy S8}