I have this ancient cookbook (by A. Escoffier), and if I add up all the different ways listed there, I’m sure I’ll come up with 50 or even more.
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Baked Eggs
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Eggs au gratin
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Devil-style roasted eggs
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Eggs in puff pastry
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Alexandra-style cold eggs
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Alsatian-Style Eggs
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Fried Eggs with Anchovies
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Andalusian-Style Eggs
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Eggs English-style
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Antwerp-Style Eggs
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Archduke-style eggs
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Eggs with Asparagus
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Eggs with Aurora Sauce
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Eggs with bacon
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Balzac-Style Scrambled Eggs
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Benetton-Style Baked Eggs
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Eggs in a Cradle
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and, and, and many, many more. If you list all the “styles à la…,” it really adds up to quite a lot.
Maybe that’s what Dumas meant.