Beef stomach chopped into harmonica-shaped coils cooked in broth is called flaki (tripe stew). All the elements of the stomach are used in the making of the dish: the omasum, the paunch, the reticulum, and the abomasum (the paunch and the abomasum being most valuable from the culinary point of view). Flaki is rich in calcium compounds, containing even more of them than meat does.
The preparation of this traditional Polish stew is a demanding process. Before using the tripe, one needs to thoroughly clean it by paring it with a knife, sprinkling it with salt, then brushing it with a hard brush and meticulously chopping off all the blackened edges. Then, after washing the tripe in cold water a few times over, one has to pour boiling water over it and keep it on boil for fifteen minutes, then drain the water off and change it a couple more times during cooking. Most recipes indicate that tripe needs to be cooked for a very long time to become tender. ‘After cooking, flaczki [‘tripe’ in the diminutive, trans.] ought to be so soft one can crush it between one’s fingers’ (W Staropolskiej Kuchni i przy Polskim Stole [In the Old Polish Kitchen and at the Polish Table] by Maria Lemnis and Henryk Vitra, Interpress, Warsaw 1983).
Classic Polish flaki consists of springy morsels cooked in thick, strong, steaming broth smelling of marjoram, accompanied by a mandatory kaiser roll (bread seems to be too sour to serve with flaki), i.e. a white flour roll with a characteristic cross carved on top.
Lviv-style, Warsaw-style