First of all, I am sorry that the photos are so dark. But... anyhoo.
So I cut the shawl and used a KnitPicks tunisian chrochet needle with a very long cable (or rather two unified cables) to pick up the stitches. Many, many of them. Then I put knitting needles on the cables.
Here is a close up on the edging so far. It's going to be at least twice as wide. It's two knit, two purl, just as I did for the Kotten blanket.
And at the very bottom, increases. This is fun. It really is great fun to make the edging. Strangely enough.
Again, sorry about the photos. Some other day, brighter photos!