Mexican Grilled Corn

• Ears of corn
• 3 cups Mayonnaise
• 2 tsp White pepper
• 2 tsp Black pepper
• ½ tsp Cayenne
• 2 tbsp Onion powder
• 1 tsp Salt
• 2 tbsp Garlic powder
• ⅔ cup Buttermilk
• ⅓ cup Spicy vinegar
• 1 Burnt onion, medium
• 2 cups Cotija cheese