8 ears fresh corn on the cob, husked and silks removed |
2 tablespoons unsalted butter |
1 small sweet onion, such as vidalia or walla walla, finely diced |
1 clove garlic, finely chopped |
2 teaspoons sugar |
8 ounces fresh or frozen edamame (fresh blanched or frozen thawed) |
1 plum tomato, seeded and finely diced |
1/4 cup grated cotija cheese |
3 tablespoons creme fraiche |
kosher salt and freshly ground black pepper |
finely grated zest of 2 fresh limes |
2 green onions, green and pale green part, thinly sliced |
1/4 cup chopped fresh cilantro, plus whole leaves for garnish |