Scrub and pierce sweet potatoes; place on a microwave-safe plate. Microwave, uncovered, on high for 12–14 minutes or until tender, turning once.
When cool enough to handle, cut a thin slice off the top of each potato and discard. Scoop out pulp, leaving a thin shell. In a large mixing bowl, mash the pulp. Add the crushed pineapple, butter, salt, cinnamon, ginger, allspice and nutmeg; mix well. Spoon into sweet potato shells.
Place on baking sheet. Sprinkle with pineapple tidbits and brown sugar. Bake, uncovered, at 325 degrees for 30–35 minutes or until heated through.
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