n a large stock pot or Dutch oven, melt the butter over medium-high heat. Add the sliced leeks and sauté for 5 minutes until leeks are soft. Add the garlic and thyme and cook for 2 more minutes, then add the potatoes, white wine, vegetable broth, and 2 cups of water. Bring to a boil, then reduce heat to a simmer and cook for about 10 minutes until the potatoes are just tender.