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Set a large pot of water on the stove over medium high heat. Bring to a boil.
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Drain the crushed pineapple.
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Wash the sweet potatoes, and place them directly in the boiling water with the skins still on.
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Boil for 45 minutes, or until they're completely soft.
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Drain the water, carefully peel the skins off the sweet potatoes (don't burn yourself!)
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Mash the sweet potatoes, and add 1/4 cup of brown sugar, margarine and crushed pineapple. Continue mashing until all mixed together.
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Heat the oven to 350°.
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Lightly grease a 9x13 pan, and spoon the sweet potato mixture into it, levelling it off at the top.
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Sprinkle the second 1/4 cup of the light brown sugar over the rest.
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Place the pineapple rings on top, and the optional maraschino cherries in the centres of the rings.
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Bake for 20 minutes, or until the brown sugar has melted.