Finish up the chametz. Clean the house. Shop and cook for the seder: it’s the same to-do list each year. But for the five 20-somethings living at Pittsburgh’s first Moishe House, this season kicks off their inaugural pre-Pesach preparation as a group. “This is our first Passover together,” said Naomi Fireman, a resident of the house that opened in August to provide a Jewish home-based environment for the young people who live there, as well as other young people throughout the community.