Fegato alla Venezia

Method

1. Heat the olive oil and butter in a large, heavy-based frying pan over a medium heat. Add the onion and cook, stirring occasionally, for 6-8 minutes, until soft but not coloured. Remove with a slotted spoon.
2. Dust the liver in the seasoned flour, shaking off any excess. Add to the hot pan and sauté quickly, about 2-3 minutes, until browned but still tender. Stir in the white wine vinegar, then add the softened onions and some seasoning and toss everything together. Serve immediately, with some creamy polenta.