2 tablespoons finely chopped onion
1 tablespoon unsalted butter
1/2 cup fresh or thawed frozen corn kernels
1 poblano chilies, roasted and minced or 1/4 cup minced pickled jalapeno
1/2 large red bell pepper, roasted and chopped fine
1/4 teaspoon ground cumin
1/2 cup grated Monterey Jack
1 garlic clove, minced
1/4 stick (2 tablespoons) unsalted butter
1 28-ounce can plum tomato, drained and chopped coarse
1 tablespoon fresh lime juice, or to taste
2 tablespoons finely chopped fresh coriander
24 won ton wrapped (available at Asian markets and many supermarkets), thawed if frozen
Garnish: 4 fresh coriander sprigs