Step 1

Bring a large saucepan of salted water to a boil. Add the corn and cook until crisp-tender, about 4 minutes. Drain and let cool. Cut the kernels from the cobs.

Step 2

Meanwhile, in a food processor, puree the tomatoes until smooth. Pass the tomatoes through a food mill or a fine sieve set over a large bowl; you should have about 7 cups of juice. Stir in the orange juice, lime juice, chile powders and the grenadine and season with salt. Refrigerate until chilled, about 10 minutes.

Step 3

Ladle the chilled soup into cups. Garnish with the olive slices and corn kernels and serve.