Season each ear with salt and pepper and top with a few pats of butter. Wrap and seal with the foil and place on a preheated grill. Grill the corn on the cob for 20 minutes, turning each individually wrapped corn on the cob every 2 minutes. How long to steam corn: Fill a pot with 2 inches of water and bring to a boil. Add shucked and rinsed ears of corn to a steamer basket and place over the boiling pot of water. Cover the pot and steam the corn on the cob for 7­-10 minutes or until the corn reaches desired tenderness.