Rustic Potato Leek Soup

Bahan-bahan (6 porsi)

• 2 tablespoons olive oil (or butter)
• 1 medium white onion, peeled and diced
• 3 leeks, sliced into 1/2-inch half moons (white and light green parts only)
• 1 rib celery, thinly sliced
• 5 cloves garlic, minced
• 1/2 cup dry white wine
• 1 1/4 pounds Yukon Gold potatoes, cut into bite-sized chunks
• 6 cups vegetable stock
• 4 sprigs fresh thyme
• 2 bay leaves
• 1/4 teaspoon cayenne (or less, if you prefer)
• fine sea salt and freshly-cracked black pepper
• optional toppings: homemade croutons, grated Parmesan, chopped fresh chives