A gratin is any sweet or savoury dish baked in the oven until it forms an appetising crust. It's very popular in France and Spain. Usually a gratin is meat or fish. The lasagna whose recipe I've already given, for instance, is also cooked "au gratin".
But this time I want to tell you about a very healthy and no less tasty recipe for a Basque-style gratin with eggs, which appeared in the northern regions of Spain and spread across the world very quickly.
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