Put buckwheat flour, water, egg yolk, flaxseed and a pinch of salt in a bowl and whisk with an electric mixer for a good 5 minutes. Put the finished dough in the refrigerator so that it can rest a little.
Take the dough out of the refrigerator. Brush either the crepe iron, the crepe pan or a normal pan with a little vegetable oil and heat. Quickly spread a ladle of the dough on the hot plate. After a short time, turn the crepe and fry on the other side.
When all the crepes are fried, fill them with the vegetables and, if you like, sprinkle with some vegan pizza melt.