For the yeast dough pancakes, mix flour with caster sugar, melted margarine, eggs, salt, crumbled yeast, lemon juice and lukewarm milk as needed to make a smooth pancake dough. Cover and let rise for 20 minutes.
Heat a little fat in a suitable pan and spread a ladle of batter and bake on low heat for 4-6 minutes, turn and finish baking.
Fill the yeast dough pancakes with jam as desired, fold and serve sprinkled with powdered sugar.