Begin by slicing the duck breast into thin, even strips.
In a bowl, whisk together soy sauce, honey, sesame oil, rice vinegar, ginger, garlic, sesame seeds, black pepper, and red pepper flakes.
Place the duck slices in a large zip-top bag and pour in the marinade. Ensure each piece is well coated. Refrigerate for at least 4 hours, preferably overnight.
Preheat your dehydrator or oven to 160°F (71°C).
Lay out the marinated duck strips on the trays or racks, making sure they do not touch or overlap.
Dehydrate or bake for 4-6 hours, or until the jerky is dry but still pliable.
Allow to cool before storing in an airtight container.