This is my all-time favorite hem technique and really quite easy to learn. Once you get the hang of it, it has a lovely rhythm--wrap, snug up, secure, wrap, snug up, secure. 

 

Tip: when you're working this, it's helpful to sit at a table or put the embroidery on a pillow on your lap since you need to get a little closer in order to see the little "bars". 

A short video of drawn thread hemming being worked