This slow-simmered stew of okra, shrimp, sausage, beans, and tomatoes is built upon a potent ham hock broth. Okra and shrimp stew is well-known in the Carolina Lowcountry, which is home to the Gullah, or Gullah Geechee, people. Its ingredients reflect a wise use of the land and sea, and its cooking methods and simple techniques reveal a cultural wisdom that simmers up both deep flavors and emotions. This long-simmered, complexly flavored mix of vegetables and seafood takes a bit of time, but…