In a bowl, beat the butter until fluffy, add the 4 beaten egg yolks and beat again, then add flour and milk, incorporate the zest of 1 orange (optional) and fold in 4 egg whites whipped to stiff peaks. (You can add previously floured chopped nuts).
Bake in the oven for 30 minutes at 240 to 250 degrees.
Grease and flour the mold beforehand.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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