Sherry Lamb Casserole

2 pounds lean lamb, cubed
4 tablespoons butter, divided
3 tablespoons brandy
1 pound small white onions
1/4 pound carrots, cut up
1/4 pound turnips, cut up
1/4 pound mushrooms, cut up
1/4 pound green beans, cut up
2 tablespoons flour
2 tablespoons tomato paste
1 1/2 cups beef broth
3/4 cup Holland House