Wash, clean, quarter and seed the tomatoes. Cut the flesh into small cubes. Wash coriander, shake dry, pluck leaves from the stalks and chop. Wash lime hot, grate dry and grate peel. Halve lime and squeeze 1 half. Mix tomato cubes, 3 tbsp. oil, coriander, lime zest and juice, season with salt, pepper and sugar.
Grate cheddar and parmesan. Peel onion and garlic, dice finely. Heat 1 tablespoon of oil in a coated frying pan. Fry the onion, garlic and jalapeños in it. Deglaze with milk, simmer for 1-2 minutes at low heat. Melt the cheese bit by bit, stirring constantly. When the cheese has reached a smooth consistency, remove the pan from the heat and season with salt if necessary
Arrange nachos, jalapeños and cheese sauce in bowls, sprinkle with chilli flakes. Add the tomato salsa