Take a small crock or large earthen pitcher, put into it warm water, salt; then stir in as much buckwheat flour as will thicken it to rather a stiff batter; lastly, add yeast; make it smooth, cover it up warm to rise over night; in the morning add soda dissolved in a little warm water; this will remove any sour taste, if any, and increase the lightness.
Not a few object to eating buckwheat, as its tendency is to thicken the blood, and also to produce constipation; this can be remedied by making the batter one-third corn meal and two-thirds buckwheat, which makes the cakes equally as good. Many prefer them in this way.
The White House Cookbook (1887).