Original 1914 recipe
Verbatim from the first edition of the Big Cookbook.

Erken's onion omelet from 1914: a butter roux with flour and onion water or milk is combined with pressed cooked onion, spices, egg yolks, and stiffly beaten egg whites, baked in a greased dish in a water bath for 25–30 minutes, and served at once.
Source: Henriette Schønberg Erken, Stor kokebok, 1914-utg. s. 395 (falt i det fri)
A soufflé-like onion omelet baked in a water bath in the oven — typical of Erken's vegetable dishes, where vegetable purée is bound with a butter-based roux and eggs.
Make the roux
Melt the butter, stir in the flour, and dilute with the milk or onion water. Bring it to a boil.
Add the onion
Add the salt, pepper, and the cleaned, cooked onion that has been pressed through a colander or press. Bring it to a boil again and take the pan off the heat.
Stir in the eggs
Stir in the lightly beaten egg yolks, and finally fold in the stiffly beaten egg whites gently.
Bake in a water bath
Pour the mixture into a well-greased ovenproof dish and bake it in a water bath in the oven for 25–30 minutes. Serve at once.
Measurements converted to modern units; "coarse colander" kept as colander/press. The method is divided into numbered steps, and the "omelet dish" is described as a greased ovenproof dish.
Original 1914 recipe
Verbatim from the first edition of the Big Cookbook.

Revised 1949 recipe
From the revised edition of the Big Cookbook.

Clean, minimally processed groceries matched to the ingredients — approximate prices.
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