Preheat oven (electric cooker: 100 °C/circulating air: 75 °C/gas: see manufacturer). Rinse steak, dab dry. Heat 2 tablespoons of oil in a large pan. Brown the steak on each side. Season with salt and pepper, remove and place on a baking tray lined with baking paper.
Cook in a hot oven for 20-25 minutes.
Meanwhile, wash, quarter, seed and finely dice the tomatoes for the salsa. Peel and finely dice the onion. Peel garlic and chop very finely. Clean the chilli pepper, cut lengthwise, remove seeds, wash and cut into fine rings.
Mix the prepared ingredients with vinegar, 1 tablespoon of oil, salt, pepper and 1⁄2 TL sugar.
Finely grate the cheese. Spread the chips on a large ovenproof plate or in a flat casserole dish. Sprinkle with cheese. Remove steak from the oven, wrap in aluminium foil and leave to rest for 4-5 minutes.
Turn up the oven temperature (electric oven: 175 °C/circulating air: 150 °C/gas: see manufacturer) and bake the chips in the hot oven for 4-5 minutes.
Wash coriander, shake dry, pluck off leaves. Cut the meat from the bone and dice it finely. Arrange meat, jalapeños and some tomato salsa on the chips. Sprinkle with coriander. Add the rest of the salsa and sour cream.