Possible Clues:

• Mixed raw vegetables served as an hors d'oeuvre
• Nibbles hard bread endlessly -- retaining awful diet
• Credit us with cooking raw fruit & veg
• Hors d'oeuvre -- it's eaten by vulgar son
• It is coated in oils to make appetisers
• Mix of raw vegetables served as an hors d’oeuvre
• Sliced vegetables appeal, served in natural oils