Method:
Preheat oven to 350°F. Put garlic into a small baking dish and bake, uncovered, for 1 hour. Set aside to let cool, then peel or squeeze the garlic cloves into a small bowl, discarding peels, and mash pulp into a paste. Set aside. Heat oil in a large pot over medium heat. Add leeks and mushrooms and cook until tender. Add wine and continue cooking until reduced to one-third. Add potatoes, broth, garlic paste, saffron, bay leaf, thyme, salt and pepper. Stir well, then simmer over medium heat until the potatoes are tender. Ladle soup into bowls and garnish with parsley.