Shinya Shokudo (2009)

Both of these dramas feature a relatively unknown main character who runs a restaurant (Midnight Diner) or bar (Lesbian Bar), where each episode focuses on different regular and new customers. They also both have a sweet mellow tone that keeps your attention, even with a lack of suspense/angst.

In both dramas a skilled make cook impresses a customer with a different dish he creates by the customer's specific demand or liking.

In Donburi linchou it's mostly the same customer... Also DL is about high-schoolers (same with cook), while Shinya shokudou has many different customers (even if some are regulars) and they are mostly adults together with the cook.

In both we observe the cook preparing the dish.. and the client eating it.

The male lead is someone who present thoughtfulness for the preparation of helping one customer at a time. The thoughtfulness of his work is similar.