If you intend to bake the omelette, heat the oven to 350F (180C).
Discard the coarse stems from the parsley, dill, and cilantro, and chop these herbs with the chives, lettuce and spinach.
Combine with zucchini, scallions and walnuts.
Crush the saffron in a small mortar and stir in 2 tsp warm water.
Beat the eggs well, add the saffron liquid, salt and pepper. Stir into the herb mixture.
To bake the omelette:.
Butter a shallow baking dish, pour in the mixture, and bake for 45-50 minutes, until the omelette has a golden-brown crust.
To cook omelette on the stove-top:.
Heat butter in a frying pan, coating it well on the bottom and sides, pour in the mixture, and cook over low heat for about 25 minutes.
Turn the omelettte by reversing it onto a plate held over the pan, and cook the other side for 10-15 minutes.
Serve hot or at room temperature, cut in wedges, with a bowl of thick yogurt.
