Instructions

1. Trim and clean the green beans.
2. Place them in a pot with enough water to cover them well, and bring to a boil.
3. After they're boiling, turn the heat down to low, cover, and let them cook until they're tender.
4. While that's going on, heat a couple of tablespoons of butter or fat in a frying pan, and saute half of the onions and the mushrooms until the onions are clear, then stir in the sour cream.  Turn the heat off as soon as the sour cream is hot.  Don't wait for it to bubble.
5. When the green beans are done, drain out their water.
6. Toss the vinegar and salt into the green beans, and let them sit a couple of minutes.
7. Then combine the mushroom cream with the green beans.
8. Fry the rest of the onion, and the ground hazelnuts or pecans together with about a tablespoon of fat, until the onions are just beginning to be clear.
9. Put the green beans and cream in a large casserole dish.
10. Sprinkle the onion and nut mixture over it.
11. Bake for half an hour to 45 minutes until the nuts are golden brown.

Serving Tips