Remove the white skin from the sweetbreads (this is the fattiest part).
Heat the olive oil in a pan, then add the sweetbreads. They are very delicate and quite milky, so you need to leave them in the pan for 2–3 minutes before turning (if you try to turn them too early they will break up). Season with salt and pepper. When the sweetbreads are caramelized, add the butter and cook until they turn golden and crispy.
Add the chillies, garlic, parsley and almonds. Fry everything for 30 seconds, just to combine, then season and eat straight away with bread.