An Evil Dragon That Was Sealed Away For 300 Years Became My Friend is a Manga/Manhwa/Manhua in (English/Raw) language, Cooking series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Youta wanted a friend, so obviously, he magically summoned one.
He didn't quite count with the fact that he'd summon Mumu, a mighty and evil dragon girl, notwithstanding that due to hundreds of years of imprisonment, she's very needy, very weepy, very clingy, and lonelier than the button "9" on a microwave oven.