After you've saved your scraps, rolled them around, and let them ferment for awhile, you'll have a dark rich mix of done compost and larger chunks of not-yet-ready stuff. You need to sift out the not-ready pieces.
I got 1/4 inch hardtack from the hardware store. Unrolled it over a wheelbarrow and clipped it down with these large clips. Shoveled the dark stuff over the top and rubbed it down. The bigger bits were thrown onto a plastic tarp. It took me about 15 minutes to do the whole trash can full and I swear--it did not stink!