Oha leaf is a nutritious, leafy-green vegetable used to cook oha soup with many health benefits. This vegetable has been known to help in the treatment of ailments. It is highly versatile and easy to add to your diet. This Nigerian specialty is thickened with cocoyam paste and seasoned with smoked fish, dried shrimp, and your favorite meats. Cook the soup until it's as thick as you like, and then stir in palm oil and oha leaves.