For a smokier salsa, char the tomato and jalapeno on the grill along with the corn. If you don't have a grill, you can roast the corn in a 400°F oven for about 20 minutes, turning halfway through. Adjust the amount of jalapeno to your desired level of spice. For a richer sauce, add a tablespoon of sour cream or cream cheese to the pan sauce. Other white fish can be substituted for tilapia