A cookware assembly or set comprising or including at least one cookware vessel of a substantially square peripheral exterior and interior form when viewed in plan, wherein the vessel has an attachment location on at least one of the four sides, the attachment location being a relief in the vessel's rim suitable for handle engagement, and a handle selectively engageable at the or any one of the attachment locations, the handle with both proximal and distal end regions having a pair of jaw elements at the proximal region for facilitating engagement to an attachment location such that a first jaw of the jaw pair locates substantially inside the vessel and a second jaw of the jaw pair locates substantially outside of the vessel, and a lid able to fit on the cookware vessel and to close, or at least substantially close, the cookware vessel.