Øllebrød (Danish for Beer Bread) is a Danish bread porridge, easily made from (dry) rye bread using this very simple recipe.
A Danish family usually had a big pot on the stove in which they threw leftover bread and beer dregs. This was served as an everyday meal, morning and afternoon. The pot was seldom emptied, so it was a kind of continuous meal.
Take some amount of rye bread, preferably without whole grain, and put it to soak in beer for 6–12 hours. Feel free to use whatever beer that is the cheapest, the alcohol is going to vaporise anyway. You can also substitute the beer with water, if you want.
Let it boil slowly for about 1 hour. Add more beer if it's too dry, the consistency should be like that of oatmeal. If you want it sweet you can mix in some sugar or honey. For a fresher taste, add a touch of lemon.
Serve with whipped cream if you're introducing this meal to someone who is not Danish.
Alternatively, here is an easy, time saving recipe. In the evening, cut away the crust from the rye bread, cut it into cubes. Put the bread in a pot and cover it with water or beer. Heat the water to a boil and then let it stand over the night, covered with a lid. In the morning, heat it while stirring until it steams vigorously, adding water if it gets too dry. Serve with milk, like corn flakes. Makes for a warm, very solid breakfast.