Starting on a non-handle side, take a stake and insert it so it goes to the inside of the tray by placing it over the two stakes to the right and then in the gap between the 2nd and 3rd stake to the right. See the first photo.
Take the next stake to the right, take it over the next two to its right and then to the inside of the tray in the gap between the 2nd and 3rd stake. Repeat this "over two and in" pattern until two stakes are remaining on the outside of the tray as in the next photo.
Take the left-hand of these stakes over its neighbour to the right and into the inside of the tray in the gap between the 2nd and 3rd stake to its right. See the photo. Take the last stake and insert it in the gap between its 2nd and 3rd neighbours to its right as shown.