Put the flour and salt in a mixing bowl, mix, dissolve the yeast in the sugar (or add the dry yeast), pour in the buttermilk and water / milk and knead in the food processor for approx. 10 minutes to form a smooth dough.
Let rise for approx. 90 minutes, shape into a loaf, cut diagonally and place in the oven preheated to 250 °. Spray water on the walls of the oven, reduce the heat to 200 ° and bake for 40 minutes.
With half the amount of yeast left cold overnight, the bread becomes a little more intense in taste. As above, it has a fine, sour taste due to the buttermilk.