French onion soup - 9Kitchen

Ingredients

• 2 1/2 litres (10 cups) chicken, veal or beef stock
• 2 bay leaves
• 4-6 fresh thyme sprigs
• 2 tablespoons unsalted butter
• 1 tablespoon extra virgin olive oil
• 1.5kg yellow onions, peeled and sliced
• salt and freshly ground black pepper
• 1 teaspoon caster sugar
• 1 tablespoon plain flour
• 500ml (2 cups) dry white wine
• 1 baguette, cut into 1cm slices
• 375g gruyère cheese, grated, plus 125g extra, cut into thin slivers