The Mpemba Effect: Hot Water Freezing Faster Than Cold

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The Mpemba effect is about the phenomena of hot water freezing faster than cold water. Does anyone know how to pronounce Mpemba?
 
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I've never heard it spoken. From the way that it's written in English (and I'm sure that it can't be directly translated), I would be inclined to think Hmm-pom-bah. There's a better than 50% chance that I'm wrong.
 
From what I can remember, the water must be VERY pure for it to work
 
But it can still contain some contaminants for proper pronunciation.