Vegan dish Lauretta mixed with oil (11)
I believe the answer is:
ratatouille
'vegan dish' is the definition.
(ratatouille is an example)
'lauretta mixed with oil' is the wordplay.
'mixed with' is an anagram indicator.
'lauretta' anagrammed with 'oil' can make 'RATATOUILLE'.
(Other definitions for ratatouille that I've seen before include "cooked vegetables in a dish" , "vegetable casserole" , "Stewed vegetable dish" , "Film" , "Vegetable stew" .)