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Step 1
Flatten the bottom of one end of your watermelon by cutting off a thin slice of the rind. Cut just enough so that the watermelon will stand upright on one end.
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Step 2
Cut a circular top out of the opposite end of the melon. Much as you would cut the top off of a pumpkin, carve out a round lid from the melon and set it aside.
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Step 3
Scoop out the fruit flesh from the melon and put it into a bowl. Pour any remaining juice into a pitcher. If you use a seedless melon you can process the fruit without removing the seeds. If your melon is seed-filled, remove the seeds with a spoon or clean hands.
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Step 4
Drill a hole in the bottom front of your watermelon where you want the tap to be. Use a drill bit a little bit smaller than the faucet you want to use as your tap. Use a sharp knife to open the hole to the correct diameter.
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Step 5
Screw in a clean, new ball valve faucet into your hole. The faucet should turn easily with one hand and have a fitting long enough to protrude through the rind of the melon. Put a rubber washer on the faucet inside the melon to assist in making a leak proof seal.
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Step 6
Mash the pulp to gather as much watermelon juice as possible. Mix rum with juice and fill the keg with the spiked juice.
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Step 7
Turn the valve to dispense the watermelon punch into guests' cups.
