Start by making the enchilada sauce. Put the onion into a medium saucepan with the olive oil and cook over a low-medium heat for 7–8 minutes, or until soft and just starting to brown at the edges.
Heat the oil in a small frying pan and gently cook the onion until soft. Add the wine and reduce the volume of liquid by half. Stir in the crème fraîche and the peppercorns. Season with salt and ...