Soufflè Topped Onion Soup - SippitySup

Ingredients

• 2 tablespoons olive oil
• 3 large yellow onions, very thinly sliced
• 1 pinch freshly ground black pepper
• 2 teaspoons plus ½ teaspoon kosher salt
• ¼ cup plus 2 tablespoons white wine
• 8 cups chicken broth or stock
• 1 dried bay leaf
• 2 teaspoons fresh thyme leaves
• 1 tablespoon sugar
• 1 tablespoon plus 1 teaspoon fresh lemon juice
• 6 slices soft white bread
• 4 tablespoons unsalted butter
• 4 tablespoons all-purpose flour
• 1½ cup whole or part-skim milk
• 1½ cup grated gruyère cheese, plus 6 thin slices
• 1 pinch cayenne pepper
• 6 ounces large egg whites
• ¼ cup grated parmesan