Beef Stroganoff without mignon basil

2 1/2-3 lbs. beef sirloin or possibly tender from steak, cut into strips 1/2-inch thick Salt and pepper to taste 1 stick butter 4-6 green onions , white part[...]

1 1/2 lb beef tenderloin cut thin strips 2 Tbsp. finely-diced or possibly grated white onion 4 Tbsp. butter 2 Tbsp. extra virgin olive oil 1 1/2 c. beef[...]