Dissolve yeast in warm milk with sugar and leave for 15 minutes. Mix with the remaining ingredients (except the coarse salt) to approach and leave for 30 minutes in a warm place. Put the dough on a floured board and divide by 16 - 18 parts, each of which roll into a \"sausage\" 30 centimeters long. Form pretzels, give them up for 15 minutes and remove the 1 hour in the refrigerator. Boil 3 liters of water with baking soda (to dissolve it thoroughly). Pretzels slightly lowered in boiling water for one to 30 minutes. Spread on a greased baking sheet and sprinkle with coarse salt. Bake at 220 degrees Celsius about 18-20 minutes.