Cover the bowl with a kitchen towel and let the batter sit for 8-12 hours at room temperature or 16-18 hours in the refrigerator.The batter won't rise because it doesn't have wheat flour, although it will bubble up some.
Once you are ready to fry the cakes, add baking soda, baking powder, sugar, and water to the bowl and mix to incorporate.
240 grams hot water , 2 teaspoon sugar, ½ teaspoon baking powder, ½ teaspoon baking soda, ½ teaspoon salt
The batter should be thicker than a crepe batter but thinner than a pancake batter.
Preheat a griddle or a frying pan over medium heat. I prefer cast iron for frying buckwheat cakes but you can use any other type of pan. I recommend using two frying pans to save time!
Brush the pan with some oil and pour the batter into it. Fry the cakes for 1-2 minutes on each side. If your pancakes look too dark or too pale, adjust the heat accordingly.Transfer the cakes onto a plate and cover them with a kitchen towel to keep them warm and soft. Repeat with the rest of the batter and enjoy!
To renew the batter (optional), keep some of the original batter (1-2 cups), add 2 cups water (or use 50% buttermilk and 50% water), ½ teaspoon salt, and 1 cup (150g) buckwheat flour, and stir to incorporate. Keep in the refrigerator until ready to bake!When ready to cook, add as much water as necessary to thin out the batter, then add the sugar, baking soda, and powder. Keep 1-2 cups of the batter to renew for the next batch.