French Dip Sandwich

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11/2 pounds sirloin, sliced across the grain on the diagonal bias until very thin

Salt and freshly ground pepper to taste

2 tablespoons olive oil, plus additional for sauteing

2 tablespoons unsalted butter

1/3 cup minced shallots

2 cloves garlic, minced fine

1 teaspoon minced fresh thyme

1/2 cup dry white wine

1 1/2 cups beef stock or canned beef broth

4 French rolls, split and lightly toasted