Onion Soup Gratinee

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1 1/2 pounds yellow onions, sliced thin

3 tablespoons unsalted butter

1 tablespoon olive oil

Large pinch of sugar

Salt and pepper

2 tablespoons flour

4 cups beef broth

1/2 cup dry white wine

A cheesecloth bag containing 1 teaspoon dried thyme, 12 parsley sprigs, 8 peppercorns and a bay leaf

1/2 cup finely minced onion

2-3 tablespoons Cognac

8 slices crusty French bread, cut 1-inch thick

Melted unsalted butter to taste

1 large clove garlic, halved

1 l/2 cups freshly grated Gruyere

1/3 cup freshly grated Parmesan