Mussel Soup

Ingredients

• 6 cloves garlic, unpeeled
• 250 ml (1 cup) white wine
• 6 black peppercorns
• 1 kg (2 lb) mussels, cleaned
• 6 green onions, thinly sliced, white and green parts separated
• 45 ml (3 tbsp) butter
• 45 ml (3 tbsp) flour
• 750 ml (3 cups) milk, heated
• 500 g (1 lb) yellow-flesh potatoes, peeled and diced
• Salt and freshly ground pepper, to taste