To make the red salsa, cook the tomatoes in a pan over low heat for around 15 minutes, stirring occasionally, to reduce to a denser consistency.
Transfer the reduced tomatoes and other salsa ingredients – onion, garlic, coriander (cilantro), jalapeños, lime juice, and seasoning – to a blender (or pound in molcajete or mortar and pestle if you have time) until just combined. Taste and adjust seasoning to suit your palate.
In a deep medium-sized frying pan or skillet over medium heat, add the oil and red salsa and heat up.
To the tomato salsa, add the fried tortilla chips (tostadas) and simmer just until the they start to soften; remove from heat immediately as they’ll continue to soften and you don’t want the tortilla chips to turn to mush.
Distribute the tortilla chips and tomato salsa between two plates.
Arrange the avocado slices on top, squeezing a little lime juice over them, and sprinkle on the finely sliced radish, cotija or crumbly white cheese, and fresh coriander leaves.
Fry the eggs to your liking and pop the eggs on top of the chilaquiles, sprinkle with chilli flakes and/or cracked black pepper, and serve immediately with additional dishes of crema (or sour cream), garnishes, chilli sauces, and refried beans.