Fry the onion in 3 tablespoons oil over medium heat until it is soft and lightly colored. Add the zucchini and sauté, stirring, until they, too, are soft.

In a bowl, beat the eggs with the flour until well blended. Add pepper (there is no need of salt because the feta cheese is very salty) and the chopped herbs, and mix well. Fold the mashed feta into the eggs, together with the cooked onions and zucchini.

Film the bottom of a preferably nonstick frying pan with oil and pour in the mixture by the half ladle (or 2 tablespoons) to make a few fritters at a time. Turn each over once, and cook until both sides are browned a little. Drain on paper towels.