----------------------------------GARNISH---------------------------------Additional sage leaves Soak beans overnight in plenty of water to cover. Drain beans and combine in a pot with the 2 litre water, onion and bay leaf. Bring to a boil and skim off any foam that rises. Reduce heat, cover, and simmer for 1 hour. Add 2 tsp. salt; continue to simmer. Heat olive oil in a large saucepan or non-stick skillet over medium-low heat and add the leeks. Cook, stirring, until leeks soften, about 5 minutes. Add the pumpkin and garlic and sprinkle with quarter tsp. salt. Continue to cook for 5 minutes, stirring often, until the pumpkin begins to soften. Ladle in some stock from the beans. Stir together and transfer the pumpkin mixture to the bean pot. Cover and simmer 30 to 50 minutes, until the beans are thoroughly tender, even mushy. Taste; adjust salt and add pepper. Remove the bay leaf and cloves from the onion. Return the onion to the soup. Put the soup through the fine or medium blade of a food mill and return to the heat. Stir in the slivered sage and heat through gently, stirring. Serve, garnishing each bowl with additional fresh sage.