We really enjoyed this dish. Made several additions and substitutions:
I added chopped white onion, asparagus, and frozen peas (throw the peas in at the end) which is nice because it adds a bit of sweetness.
I also added dried basil and fresh sage.
I doubled up the garlic and used half of it while sauteing the shrimp.
Instead of escarole or chard, I used kale which is really good for you.