It's pretty simple to do. First you want to section the hair into thirds, vertically down the head. Like so:
Then you will make a small horizontal part. Take that part and separate it into halves. Like so:
Here is the slightly tricky part. Tie those two pieces into a knot. Before pulling tight, loop the ends around one extra time. It should look like this now:
Continue all the way down the head, adding the extra pieces to the piggies. It makes for a fun look at the end. Happy stylin'!