Years ago when I was making my first blanket.
I wanted a firm edging for it and discovered Crab Stitch.
I looked on-line for help in how to do it because all my efforts didn’t seem to give me what I needed. At last I found instructions that worked and later I wrote up my version of the method for anyone else who was interested and as something I have referred to ever since when I needed to remember.
These instructions are in my Tutorials section of the Menu under Crochet.
They involve turning the hook through 180 deg which works very well.
Now recently, after having had to revisit the instructions when making the ear-saver
I saw a post with a video of someone doing the stitch and decided to watch.
They, like so many written versions, did not seem to need to rotate the hook and so I decided to try doing it their way.
But at first I continued to get simply the normal double crochet worked in the other direction as you can see here.
I decided that their secret must lie in the pulling of the first loop through but it didn’t seem to be highlighted in the pictures and happened too quickly to see in the video. So I stared and I thought. Finally I noticed that in the video the hook was inserted upside down which seemed very awkward but I tried it and after many attempts I eventually managed to see how to twist my hook to get the required result.
Maybe it should be called upside-down stitch.