2 tablespoons butter
1 package Earthbound Farm Organic Celery Hearts, 2 whole (trimmed and sliced thin, leaves reserved)
2 leeks (white and light green parts only, sliced thin)
1 medium Yukon Gold or yellow potato (peeled and diced)
1 cup whole milk or half and half
2 cups vegetable or chicken stock
1/4 teaspoon celery seeds (or more to taste)
  Sea salt and freshly ground black pepper (to taste)