I have somewhere, one or two recipe books form my old grand-grand-mother.
There were several recipes, for 6 or 8 portion cakes, calling for 40 or more egg yolks, almond flour, butter and sugar. Whites for the topping.
I don t know if you can substitute sugar, but, if you can, that would be an Atkins paradise.

Ps. I tried those cakes many times as a kid, they were more than delicious.

Ps2. I have to find these books.
3a/b, CG mostly.
Mexico City.