Stir eggs, mineral water and milk until smooth. Stir in flour with a whisk. Let the dough rest for a while. In the meantime defrost the peas. Clean, wash and cut the peppers into small cubes.
Drain the corn. Wash herbs, dab dry. Cut chives into small rolls, chop parsley finely. Put aside about 2 teaspoons of chives. Stir the herbs into the dough. Heat 1 tablespoon of oil in a pan (26 cm Ø).
Fry half of the peas, peppers and corn briefly in it. Season with salt and pepper. Spread half of the dough on top. Cover and bake at low heat for about 6 minutes. Turn with the help of the lid and bake again for about 6 minutes.
Keep pancakes warm. Process remaining vegetables and dough in the same way. Put sour cream on the pancake and serve sprinkled with chives.