Cook the lasagne sheets in boiling salted water for about 12 minutes. In the meantime wash and halve the cherry tomatoes. Heat the oil in a pan. Sauté the cherry tomatoes in it. Deglaze with chunky tomatoes, bring to the boil and simmer for about 5 minutes. Season with salt, pepper, cumin and oregano.
For the dip, halve the avocado and stone it. Remove the flesh from the skin, dice roughly and crush with a fork. Stir with sour cream and lemon juice until smooth. Stir in the avocado puree. Season with chilli flakes.
Drain the lasagne sheets, quench them, let them cool down and pluck them into large pieces. Heat butter in a pan. Fry the lasagne sheets for 2-3 minutes until golden brown. Coarsely crumble the tortilla chips. Layer lasagne sheets and tomato sauce in plates or bowls. Add avocado dip as a blob. Sprinkle with taco crumbs. Garnish with oregano.