Grilling corn on the cob in aluminum foil requires wrapping the corn in the foil and grilling it for approximately 20 minutes on medium heat. Food Network and Reynolds Kitchen both suggest using heavy-duty aluminum foil to grill corn on the cob.
The Reynolds' recipe requires centering 4 ears of corn on the cob on a sheet of foil. Add 2 ice cubes. Wrap the foil around the corn. Double the corners and sides inward. Make a pocket for the heat to circulate inside the foil. Cook the aluminum foil packet for approximately 20 minutes on medium to medium-high heat. The Food Network recipe requires the same technique to cook 8 ears of corn on the cob. The same cooking time is required for cooking the corn on the cob until it is tender.
Both recipes suggest seasoning the corn on the cob with different ingredients for additional flavor. The Reynolds' recipes suggests adding 1/4 cup butter or olive oil, 2 tablespoons of grated Parmesan cheese, 1/2 teaspoon of dried and crushed rosemary leaves, 1/2 teaspoon of salt and 1/8 teaspoon of pepper. The Food Network recipe includes 1 cup of butter, 1/4 cup of minced cilantro, 1 teaspoon of salt and 1/2 teaspoon of ground black pepper.