Finely chop the onion and add to the pot; cover and simmer for 5 minutes or until tender.
While this is cooking, core the tomatoes, seed them and chop them, then add to the pot and simmer for 5 minutes.
Add the chicken broth and bring to a simmer and while this is coming to a simmer, remove the corn kernels from the ears of corn; add them to the broth and simmer for 4 minutes.
Remove the soup from the heat, add the lime (or lemon) juice and season to taste with salt and dried red pepper flakes.
Garnish with cilantro (or parsley).
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