I may be a single 20-something living in the Upper East Side, but the hot new item in my life is my Slow Cooker. Sexy, I know. Still, I’ve fallen in love with the Christmas gift that can cook my dinner while I’m plugging away at the office. This may not be breaking news, but after living in South Florida for most of my life, the need for hearty warm food everyday was non-existent. I mean, who wants beef stew when its 70 degrees in January? Negative. But in the last year and half of living in the Big City,…