Some times called camel stitch this stitch gives a lovely ribbed effect I like to use on sweaters and hats.
Complete a row of HDC as usual
The horizontal bar is highlighted in green
Stitch loops in pink, keeping both stitch loops behind your hook, yarn over, insert hook in horizontal bar, complete HDC as usual.
The stitch loops form a ridge
Ribbed effect with a couple of rows
It really is that simple, I used this stitch for the ribbing around the waist and cuffs of the Helena Sweater