Welcome to Klein's Kosher. Located in Waterbury's Jewish Community, Klein's Kosher serves up Connecticut's finest Kosher foods with exciting dishes and unique ambiance. At Klein's Kosher, every dish is created using only the freshest, finest ingredients. Klein's Kosher offers the finest full service catering in all of Connecticut. All of our products are strictly Glatt Kosher and under the supervision of The Vaad Hakashrus of Greater Waterbury.