No Greek yogurt on hand? Full-fat sour cream or a spoonful of mayonnaise works just as well for that creamy, tangy pull. Frozen corn works in a pinch out of season—thaw and pat it very dry before roasting so it chars instead of steams. Want more crunch and color? Fold in diced red onion, thin radish slices, or a handful of chopped green onion. Leftovers keep in the fridge for up to 3 days, though the corn softens a little each day. This salad doesn't freeze well.