Preheat the oven to 400 degrees F. Pierce the sweet potatoes all over with a fork and microwave on high until cooked through, 8 to 12 minutes, turning them over halfway through the cooking time. Start checking for doneness during the last 4 minutes of cooking time. They should feel soft when you squeeze them. Cut into thick rounds and arrange decoratively in a small or medium baking dish.
Stir together the melted butter, honey, cinnamon, allspice, ginger and 1/4 teaspoon salt until smooth. Pour over the potatoes and toss to coat. Roast until the honey butter is bubbly and the potatoes are glazed, about 20 minutes. Sprinkle with a pinch of salt and top with pecans.
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