Preparation Preheat oven to 400°F. Butter 13 x 9 x 2 - inch glass baking dish. Pierce potatoes in several places with fork. Place on baking sheet; bake until very tender when pierced with knife, about 1 hour. Remove from oven. Reduce temperature to 350°F. Meanwhile, melt 2 tablespoons butter in heavy large nonstick skillet over medium-high heat. Add pears; sautée until beginning to soften, about 5 minutes. Add 3/4 cup nectar; bring to simmer. Reduce heat to medium-low; cover and simmer until pears are very tender, adding more nectar if mixture sticks to skillet and stirring often, about 4 minutes. Transfer to processor and puree. Peel sweet potatoes; place in large bowl of electric mixer. Add 4 tablespoons butter; beat until smooth. Mix in pear puree, sugar, cinnamon and cardamom. Season with salt and pepper. Transfer to prepared dish (Can be prepared 1 day ahead. Cover and chill.) Bake potatoes uncovered until just heated through, about 20 minutes.
Preparation Preheat oven to 400°F. Butter 13 x 9 x 2 - inch glass baking dish. Pierce potatoes in several places with fork. Place on baking sheet; bake until very tender when pierced with knife, about 1 hour. Remove from oven. Reduce temperature to 350°F. Meanwhile, melt 2 tablespoons butter in heavy large nonstick skillet over medium-high heat. Add pears; sautée until beginning to soften, about 5 minutes. Add 3/4 cup nectar; bring to simmer. Reduce heat to medium-low; cover and simmer until pears are very tender, adding more nectar if mixture sticks to skillet and stirring often, about 4 minutes. Transfer to processor and puree. Peel sweet potatoes; place in large bowl of electric mixer. Add 4 tablespoons butter; beat until smooth. Mix in pear puree, sugar, cinnamon and cardamom. Season with salt and pepper. Transfer to prepared dish (Can be prepared 1 day ahead. Cover and chill.) Bake potatoes uncovered until just heated through, about 20 minutes.