1. MAKE THE CORN STOCK:
Remove the kernels from the corn and set aside. Snap the cobs in half. Heat vegetable oil in a large stockpot over medium-high heat, then add the onion, carrot, celery, and peppercorns. Cook, stirring frequently, for about 8 minutes, until the onion is translucent. Add the cobs and 2 quarts of cold water. Bring to a boil, reduce the heat to low, and simmer for 40 minutes. Strain through a colander into another pot. Toss out the solids.