Normally I wouldn't be pulling onions until next month, however we had a couple of puppies decide to play in the onion bed, so more than half my bulbs were uprooted.
First you want to lay your onions out to dry for a couple of days. Allowing them to crust up, and the skins to be nice and dry.
Once confident in that, time to braid. You will need some string or twine.
Food the twine in half. Make a loop at the end,
Take the opposite end and run it through the loop.
With the next onion, place the top between the two strands of twine, wrap around one side, then the other, almost a figure 8.