French Style Mushroom Soup, au Gratin

Ingredients

• 150g Swiss cheese, grated or sliced
• 2 tbsp Parmesan cheese, grated
• 2 tbsp olive oil
• 6 cups sliced assorted fresh mushrooms
• 1 small onion, chopped
• 1 clove garlic, minced
• ½ cup dry white wine
• 6 cups chicken stock
• 1 tsp finely grated lemon rind
• ¼ tsp nutmeg, ground
• ¼ tsp pepper, ground
• 4 slices French bread, toasted (1-2cm thick)