Riffing off the idea of steaming fish in banana leaves and baking fish in aluminum foil packets, using hardy kale leaves as a wrapper for delicate flounder gives you a neat little package whose crispy edges add a great texture. The aromatic fennel with herbs like fresh oregano and parsley plus the zing of lemon juice make it extra flavorful.
Boil salted water in a large pot and blanch the kale leaves for about 30 seconds, then place them in an ice water bath, remove and set aside on a kitchen towel.
Using a sharp knife, cut the flounder into 4 even fillets and season both sides with salt.
Preheat the oven to 350 degrees and oil the bottom of a large glass baking dish with olive oil. On a clean work surface, take 1 kale leaf and place a lemon round, followed by some parsley, oregano, and fennel in the middle. Sprinkle some cracked pepper on top then place a flounder fillet on top and fold or roll the edges in and place in the baking pan seam-side down. Repeat with the other fillets.
Pour the broth into the pan and drizzle remaining olive oil on top of the kale packets. Bake for 30 minutes.