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Swedish 🇸🇪 Knäckebrödread (crisp bread) is an ancient baked good intended to last a long time. You can achieve an airy texture with a bit of yeast, but you can also use something Sweden has ample amounts of in winter: snow ❄️ Mixing this into the dough, and then putting the bread into a very hot oven, causes the snow to quickly turn to steam and form air pockets. Today, this process is achieved industrially by blowing air or steam right into the dough, but isn't it interesting how innovative people were in olden times?