The other day I lifted the Onions and put them to dry prior to stringing. For this purpose I use what I think are old bread trays. They have open bottoms so when turned over and placed on the potting shed bench I can place the onions in them upside down to dry. I will leave them like this for a couple of weeks and then clean off all the dirt which should be dry by this time and then string them up. The proper way is to plat the tops together but I find using sting less of a faff.