Put the olive oil into a pan on a medium heat and add the chistorra. Cook for 2–3 minutes, stirring. When it starts to get golden brown and give up its fat, add the cider and reduce by half, until you see that the liquid has emulsified to make a sauce. Taste the sauce and season with salt and pepper if necessary.
Serve warm in little bowls, with toothpicks and pieces of toast.