Warm a large skillet on medium heat. Add EVOO, corn, red onion, Jalapenos. Heat until edges are "roasted", set aside to cool.
Add the rest of the corn relish ingredients to the roasted corn mxture and place in a cool spot.While the relish is cooling warm the can of refried beans per instruction on can and warm the tostada shells @ 350 for 5 mins.
Layer your tostada. I layer mine with refried beans,avocado slices, letuuce, tomato, corn relish, cheese, sour cream and salsa but you can layer it however you want.