In a saucepan, brown the shallots in the butter. Add the broth and potatoes. Season with salt and pepper. Bring to a boil. Cover and simmer until the potatoes are tender. In a blender, purée the soup and foie gras until smooth. Adjust the seasoning. Pour into espresso cups and add a drop of truffle oil. Season with pepper.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.