FIGS. 6a-6c illustrate various versions of the drain-back slope 47 with the conventional groove 21 and crimped rim 33. The pull tab 30 is shown in various locations and various configurations on the platforms 31. Since the indented groove formed by the slope 47 is shallower than the groove 21, it is much easier to clean. The positioning of the tab 30 is important so as to permit cleaning under the tab 30.