For the salsa, drain the corn in a sieve. Peel onion and dice very finely. Clean the chilli, cut lengthwise, remove seeds, wash and chop very finely. Wash coriander, shake dry, pluck off leaves and chop.
Mix the corn, onion, chilli, coriander and 2 tablespoons of oil. Season to taste with salt.
For the sour cream, wash parsley and chives, shake dry and chop or cut into fine rolls. Mix quark, vinegar and herbs. Season with salt, pepper and 1 pinch of sugar.
Mix flour, 1 teaspoon salt, 1⁄2 teaspoon paprika powder and 1⁄2 teaspoon cayenne pepper. Whisk eggs and milk in a deep plate. Form 12 strips (approx. 10 cm long, 3 cm wide) from the mince. Turn the steak fingers one after the other in the seasoning flour, the egg milk and again in the seasoning flour.
Heat 2 tablespoons of oil and butter in a large frying pan. Fry the steak fingers in it in portions all around for about 10 minutes. In the meantime heat up a second pan without fat. Fry the tortillas one after the other for about 1 minute each while turning.
Arrange steak fingers, salsa, sour cream and tortillas.