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A sea cucumber often looks like a large worm ( or a cucumber ) , and is basically a tube with an intestinal tract inside . Most of these varieties originated in Europe ( they are sometimes called European or English cucumbers ) , and they tend to be thin , smooth skinned , and one to two feet in length . Dutch type cucumbers ( Cucumis sativus ) ( also called European or English cucumbers ) , the long , thin skinned , seedless cucumbers available in most grocery stores , are one of the major greenhouse crops grown in Florida . There are cold and hot starters such as salads , fish solyanka ( a thick soup with vegetables and salted cucumbers ) , ukha ( traditional fish soup ) and caviar and an extensive section of other home-made dishes .