This stitch can be used in so many variations of the original stitch. It is similar to a fly/feather stitch. I am afraid this particular stitch feels rather awkward for me, and I can only suggest it is difficult for a lefty like me to master.
There are some wonderful variations, once you get a handle on this stitch. You can do beautiful closed stitches, weave another colour through them or create the most gorgeous leaves. But they are a bit beyond me at this point.
So here is the basic stitch, and when and if I master it, I will show you some variations.