Source: Bilha Widmann
Steam or boil the leeks over high heat for 5-7 minutes. Hold under cold water to stop the cooking.
Chop the leeks finely. Press them in a clean dishtowel, to get all the liquid out.
Put the dried chopped leeks into a large bowl.
Add the beaten egg, matzoh meal, thyme, cinnamon, and salt and pepper to taste. (The batter should be soft enough to drop from a spoon. If necessary, add more matzoh meal to thicken, or add water to thin.)
Heat oil in a large frying pan, at middle to high heat. Drop spoonfuls of the batter into the hot oil, and fry 2 minutes or until the underside of the pancake is browned. Turn over and fry 1 minute or until the other side is brown.
Drain the pancakes on paper towels. Serve garnished with pieces of lemon if desired.