I have forgotten what green leaf Raw Chef Dan used in his wraps, but I have used his technique successfully with romaine lettuce, to make wraps I can deal with.
What did Dan show us? He took a coffee mug and rolled it on the leaf to crush it. Then he peeled the leaf sides from the tough central stem.
I used this technique to make some delicious wraps with a nut/seed pate and a smidgen of sauerkraut for a party I went to last week. I am happy to say that there were no leftovers (although I could have used some for the next day’s lunch!) The good thing here, for me, is that I am now more romaine-friendly.