An Evil Dragon That Was Sealed Away For 300 Years Became My Friend is a Manga/Manhwa/Manhua in english language, Cooking series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl 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.