Vinegar
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Pour 1 pt. of water and 1/2 cup vinegar into the pot.
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Put the pot on the stove, and heat on low for 30 minutes.
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Pour the liquid down the drain, allow the pot to cool and wash it with dishwashing soap and a dishcloth. Do not use abrasive scrubbers, which could scratch the pot's finish.
Lemon Juice
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Cut the lemon in half.
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Rub the inside of the lemon half over the stained area, and repeat with the other lemon half. Or pour 1 tbsp. of bottled lemon juice on a dry dishcloth and rub it over the stained area.
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Wash the pot with a wet dishcloth and dishwashing soap, and rinse.
Ketchup
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Put 1 tbsp. ketchup or tomato juice on a dry paper towel. You can replace steps 1 and 2 of this process by cooking tomato sauce in the stained pot.
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Rub the ketchup over the stained area, and let it sit for 15 minutes.
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Wash the pot with a wet dishcloth and dishwashing liquid, and rinse.