Look for crema at Latin markets or by the supermarket's Mexican cheeses. It's slightly tangier than sour cream.
Preheat the grill to medium heat.
Combine cheese and next 4 ingredients (through pepper) in a small bowl.
Place corn on grill rack. Cover and grill 8 minutes or until lightly charred, turning occasionally. Place corn on a serving plate; drizzle with crema mixture. Serve with lime wedges.
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