We grow edible hibiscus, Cranberry Hibiscus and Rosella/Roselle (Hibiscus sabdiffera) very easily in our climate. Here is a use for the sepals from the flowers of the Rosella.
Click on the link for the recipe.
The red sepals of the Roselle plant (Hibiscus sabdariffa) is commonly called sorrel in the Caribbean. The young leaves are great in salads, with a sour taste very similar to sorrel (Rumex acetosa), the vegetable of European origin (hence the common name.