I had this appetizer at a home party. I had to have the recipe. When I asked it was just so simply put. "Wrap kielbasa in pastry, brush with egg, bake and dip." She didn't know what mustard she used because her husband just grabbed it from the store shelf, now the jar was long gone. In a search of the grocery aisle I spied this jar of Honeycup mustard. The ingredients sounded yummy and could of been what she had. Bought it! Baked it up! Yummy! Yummy! NOTE: I do think you could use puff pastry instead of pastry sheets. You might be able to slather the Honeycup mustard on the kielbasa before rolling it up in the pastry sheets....I am certainly going to try it next time I bake it up. Please don't substitute the mustard without trying this first....it is a thick mustard that is both sweet and sharp. It is a product of Canada, so might be found in the specialty aisle if not with the mustards.