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There a customer can order dishes that he would not be able to enjoy had the restaurant not established a menu on the basis of recipes, ingredients, and practice in preparation.
Could anyone tell me what does the sentence in the box mean? Is it grammatically correct?
Source:
This is conditional inversion, a construction in which a condition clause is expressed by subject-auxiliary inversion instead of with if:
... if the restaurant had not established ...
↓
... had the restaurant not established ...
Today this is permitted only with the auxiliaries had, were and should, and it has rather an old-fashioned ring.
You can find many more questions about this construction by searching on the tags conditional-constructions and inversion.
