Hi Kerstin, Sorry you had issues whipping the whites. It can sometimes be more difficult with the kind from a carton. The cream of tartar helps, but sometimes isn’t enough. Did you wait for the whites to be at room temp before beginning? This can help with whipping. Unfortunately the bread won’t turn out very well without getting the whites to stiff peaks. I hope it works for you next time, and if the cartons don’t work for you, you can try with the whites from whole eggs. You can use the yolks to make hollandaise sauce or creme brulee like this.
Maya, this is a beautiful looking bread. I’m going to try it, but before I do, I’d like to know if you have ever tried doubling the recipe. It seems that it would work–based on the fact that my almond flour bread that I have made for years uses 3 1/4 cups flour, and turns out pretty well. (I’m pretty content with my recipe, but admit that yours looks better due to the whiteness and it appears to have more air bubbles, indicating it’s probably lighter.) If I don’t hear from you, I’ll probably go ahead and double it, and use a 9×5 pan–wish me luck.