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Put the pot on the stove, add the chicken broth and bring it to a boil over high heat. Add the orzo, turn the heat down to low, and cook until the orzo is tender, about 15 minutes. (If you’re using rice, you’ll need to cook it 10 minutes longer.)
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While the broth mixture is cooking, put the eggs and lemon juice in the bowl and whisk until creamy yellow.
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Using the ladle, add some of the broth mixture to the egg mixture, very gradually and whisking all the while, being very careful not to let the eggs curdle. (This is called “tempering” the eggs.)
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Slowly pour the egg mixture into the soup pot, whisking all the while, until the broth and eggs are completely combined. Cook over low heat for 10 minutes.
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Taste the soup. Does it need more lemon juice? A pinch of salt? If so, add it and taste again.
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Serve right away garnished with the parsley, mint, or dill and, if you like, the grated lemon zest.
