Mix filling: Mix raw beef and turkey with all marinade ingredients and scallions.
Soften rice paper: Dip rice paper briefly in warm water until pliable.
Roll: Divide filling evenly between sheets, place on lower third, and roll tightly.
Prepare for steaming: Transfer rolls to a lightly oiled heat-safe plate.
Steam: Steam covered for 10–12 minutes until fully cooked.
Serve: Mix sauce ingredients if using and spoon over before serving.
