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Spoon desired amount of yogurt into a cup.
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Slowly add a small amount of soda. Stir in with the yogurt until there are no lumps.
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Slowly add a bit more soda, and stir as before until the lumps are gone.
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Add the rest of the soda and stir well.
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This recipe is very adaptable. You basically add as much yogurt and soda as you like until you get the desired soda-to-yogurt ratio.