In a medium saucepan, place spinach with 1/4 cup water. Bring to a boil. Reduce heat to medium, cover and cook approximately 10 minutes, stirring occasionally.Advertisement
In a medium saucepan over medium heat, slowly cook and stir onions in butter until tender.
Place spinach, onion, crabmeat, Parmesan cheese and dry sherry in a small baking dish. Mix thoroughly. Bake in the preheated oven 15 minutes, or until bubbly and lightly browned.