What is "filets"

Usage examples of "filets".

They lunched at length, starting with cold cucumber soup and going on to Filets de Sole Veronique, followed by pheasant and a champagne ice cream, Augusta had never heard of, much less eaten.

With a little gentle prompting from her host she decided on souffle Eleonora, followed by filets de barbue all champagne and obediently drank the excellent sherry she was offered.