#3 is #1 in my book! — Les Petites Gourmettes

Ingredients

• 1 teaspoon olive oil
• 2 teaspoons unsalted butter
• 2 medium onions, peeled and cut into medium dice
• 2 teaspoons sugar
• 1/4 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 1/4 cup sour cream
• 2 tablespoons prepared creamy horseradish, or to taste
• Salt and freshly ground pepper to taste
• 1 tablespoon olive oil
• 1 tablespoon unsalted butter
• 1 shallot, peeled and minced
• 2 garlic cloves, peeled and minced fine
• 1/2 teaspoon minced fresh thyme
• 1/4 cup dry white wine
• 3/4 cup beef broth
• 3/4 cup leftover beef, sliced across the grain on the diagonal bias as thin as possible
• 2 French rolls, split and spread lightly with butter