Add the chicken broth (or wine), lemon juice, and lemon zest to the skillet and bring to a boil. Simmer the liquid until reduced by half, about 3-4 minutes. Add the remaining tablespoon of butter, wait for it to melt then turn off the heat. Add the pasta, shrimp, and parsley to the skillet, season with sea salt, to taste then toss to coat evenly. Serve immediately. Enjoy.