Using a Tunisian crochet hook, chain any number of stitches or the number indicated in your pattern.
Work a foundation row of a basic forward pass and return pass or add onto an existing swatch of stitches.
Bring the working yarn to the front of your work and insert your hook through the next vertical bar. Wrap yarn behind and over the hook.
Pull through vertical bar loop on hook. Your first Tunisian purl stitch is complete. Continue these steps across row until 1 stitch remains; work last stitch of row through the full 'V' as shown in the Tunisian Simple Stitch Tutorial. This gives a nice finished edge.
Work a basic return pass (that is, yarn over and pull through one loop, then yarn over and pull through 2 loops for the rest of the row until you have one loop left on your hook).