WARNING! This article contains SPOILERS for Dexter: Original Sin season 1 episode 2!Throughout the original series, Dexter Morgan was known for frequently bringing a box of donuts to work to share with his coworkers, and Dexter: Original Sin finally reveals where that idea came from. As Dexter: Original Sin’s timeline takes Dexter back to the first time that he really joined a team and began honing his social skills, it becomes increasingly apparent that once he learned these strategies to make others like him, he never stopped using them. Case in point, bringing donuts for his colleagues, which he not only did all throughout Dexter’s original series, but also in New Blood.

https://screenrant.com/dexter-original-sin-donut-origins-revealed-explainer/