Both in the Middle Ages as in prehistory the same story: using a bread oven. For a bread, you need to grind corn (a very time consuming effort), make dough of it and let it rise with yeast. This is what one discovered first in the 19th century, before this date, one used sourdough what is made by mixing flour with water and let it stay for a couple of days. It turns a bit sour and when you look right, you will see small bubbles appearing. By doubling the mixture every day with fresh water and flour, you – so to speak – feed the sourdough.
An oven is made from a floor of baked clay and a dome over it – also made of clay, later out of bricks. You should fire this oven quite aggressively, feeding the fire with dry branches. When it is hot enough, you empty it, enter the breads and sealing it. Not long before the bread is ready. One can see this process almost daily in our museum.