There are actually a total of four seasons of Shinya Shokudo (Midnight Diner), with the fourth season being exclusive to Netflix (which made it internationally, or at least available and accessible from the USA) and is titled “Tokyo Stories” or something like that. There are also two full length Shinya Shokudo big screen movies available, movie #2 was aired on the big screen in Japan last November and the Bluray came out (Asia/Japan) last May.
More Gourmet J Drama trivia: The writer and creator of Samurai Gourmet is Masayuki Kusumi, who is the manga artist for Kodoku No Gurume 孤独のグルメ (The Lonely Gourmet). This has also been ported over to a well established (and fun to watch) TV series with 6 available seasons. The lead character of the TV series is played by veteran actor Yutaka Matsuhige, who coincidentally also plays the role of “Ryu-chan”, the sunglasses wearing Yakuza character in Shinya Shokudo. Kusumi is also the leader of his band called The Screentones, who provide the entire soundtrack to the TV series of Kodoku No Gurume.