How To make Kalvefilet Med Sur Flot (Saut

3 tb Butter; unsalted
3 tb Vegetable oil
1/4 c Onion; finely chopped
4 lg Veal scallops; sliced 3/8"
-thick and pounded to 1/4" -thickness Salt & Pepper 1 c Sour cream
1/2 c Gjet