By Hikari Hayakawa:
Kirara no Shigoto, about sushi set in modern Japan. Main character's a girl.
By Rokuro Kube and Tan Kawai:
Ramen Hakkenden, about ramen in modern Japan.
By Tetsu Kariya and Akira Hanasaki:
Oi Shinbo, about all sorts of food. Over 100 volumes, famous for its unique (some would say bad) art that hasn't changed for decades.
By Tetsuji Sekiya:
Bambino! about an amateur cook who goes to work in one of Tokyo's most famous Italian restaurants. If most cooking manga fall into shonen (Yakitate-esque reactions and the main character nearly always pulling through) Bambino! would be seinen. It's about as realistic as you can get, with the focus mostly set around the main character's life working at the restaurant (it's a long time before he can even work in the kitchen) but also looking at his life in general.