Bohnen mit Speck

Instructions

1. Top and tail the green beans and cut them in half if needed. Cook them for 20 minutes in boiling salted water, then drain, keeping a little of the cooking water.
2. Fry the diced bacon for 5 minutes in a pan, then add the sliced onion and let it brown.
3. Sprinkle the flour over the onion, stir for 1 minute, then pour in the stock and a little cooking water, whisking.
4. Add the vinegar and let the sauce thicken for 3 to 4 minutes over low heat.
5. Tip the beans into the sauce, stir and simmer for 5 minutes so they soak up the flavour.
6. Adjust the seasoning with salt and pepper, then serve hot.