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Boil water, not too much. ~ 1 cup.
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When the water boils, add the peas and wait for it to boil again.
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Once it boils, remove the water as fast as you can (you can just transfer it to another bowl, but that will make the peas cool faster).
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Place the slice of cheese on top and wait for it to melt, characterized by it molding into the shape of the peas.
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Meanwhile just add butter randomly, to taste. Butter melts even at room temperature so don't be hasty and add it before the cheese since cheese is harder to melt.
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Simply mix the whole mixture - your cheese won't chunk up, don't worry!
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Voila! Serve while still hot!