Mix of fuels for light baking (7)

I believe the answer is:

souffle

(Other definitions for souffle that I've seen before include "Very light baked dish" , "light dish is presented" , "Light fluffy dish with a base of egg yolks and stiffly beaten egg whites" , "Dish made of egg yolks and stiffly beaten egg whites" , "Frothy dish made with egg whites" .)

I've seen this clue in The Telegraph and The Sun.

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