It takes a bit longer to work this stitch in comparison to the simple stitch, but it creates a nice structure. Here is a photo tutorial.
Tunisian Purl Stitch
To begin with, complete one row in Tunisian Simple Stitch.
Now “drop” yarn and insert hook under first vertical loop (just the same as in Tunisian Simple Stitch).
Hold the yarn as usual again.
Yarn over, pull through loop. First one completed!
Go on doing the same with every vertical loop until you reach the last one on the edge.
Insert hook under two loops. You will get a stronger edge. Pull through. Ch 1 and go back as usual.
Your first Tunisian Purl Stitch row should look like this.