Melissa's Corporate Chefs
Cook the boniato in water until tender.
Sauté onion in oil until transparent.
Purée the boniato in a blender or food processor.
Add cooking liquid and onion in batches until smooth.
Return the purée to the pan and stir in the yogurt and salsify (if using), reheat gently.
Serve garnished with the parsley and orange.