Put the chillies on a hot frying pan to toast for 3 min making sure to turn them around to avoid burning them.
Then put the chillies, onion, tomatoes and garlic in a blender and blend very well, in the meantime, heat the oil, with low heat, in the same frying pan where you toasted the chillies and add the salsa you just blended. Add salt to taste and cook for 15 min.
Have it with your breakfast, tacos or any other Mexican dish!
Notes
Tips
If you can't find Puya chillies in the UK, you can use arbol chillies, which are widely available in the Mexican online shops.