In a copper or stainless steel saucepan, heat the olive oil. Add carrots, potatoes, salsify, pear, and turnips. Saute vegetables until golden brown. Add porcini mushrooms, cook 2 more minutes. Add mushroom stock and reduce until vegetables are tender. In the last two minutes, add swiss chard. When the sauce is reduced, season with salt and pepper. Put into bowls and garnish with peeled grapes.