Our land lady in Germany used to make these in the spring and summer time. I feel these are good anytime hot or cold. My husband used to take them on deployments when we were in the military. I would wrap them in foil and off he would go.
Prep your skirt steak, should be thinly sliced the length of steak. Your best bet is to have your butcher slice it for you. They don't charge for this service, plus it saves prep time. Prep all vegetables, also dill pickle, sliced thin length wise.
In a bowl place mustard, garlic, sea salt, and horseradish, mix well. With a pastry brush, brush one side of the steak slices with the mixture, one at a time. Place one slice of onion, one slice bell pepper, and one slice of dill pickle. Roll the steak around them, Then wrap a strip of bacon around it and fastened with a toothpick. Repeat till they are all done. Place in oven, cook for 30 minutes or till golden brown. Turn meat every so often. This also Fantastic cooked on the grill.
The sauce is for dipping: In a saucepan, add Worcestershire Sauce, Boiling water, 6 bouillon cubes disolved, sugar, pepper, horseradish, bring to a boil on medium heat. In a shaker or small jar place water and cornstarch. Shake or stir with fork till desovled, pour slowly into other mixture stirring sonstantly till gravy sauce has thickened and comes to a boil. If the sauce becomes to thick add water a tablespoon at a time to thin it down. This is great to dip the Rouladen in or you as a gravy on top. This is great for picnics too.