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Heat a small saucepan over medium heat. Add 1 tablespoon of the butter and swirl to coat the bottom of the pan. Add the garlic and ginger and sauté, stirring occasionally until the garlic is brown, 3 to 4 minutes. Add the cream and reduce by one-third over low heat, about 10 minutes. Keep warm.
Meanwhile, combine the yams in a large saucepan with enough water to cover them completely. Bring to the boil over high heat and cook until the yams can be pierced easily with the tip of a knife, 20 to 30 minutes. Drain and transfer to a food processor. Add the cream and process until well blended. Add the remaining butter, season with salt and pepper, and puree until smooth.
Transfer the potatoes to a bowl and serve.
Source: Boston Chef Ming Tsai