To use grilled corn on the cob instead of canned: Preheat a grill or grill pan, rub corn all over with oil and season generously with salt and pepper. Cook for about 8-10 minutes, turning every couple of minutes to ensure even cooking, until corn kernels start to char a bit. Allow to cool for a few minutes before using a sharp knife to slice kernels off of the cob and distribute between the meal prep containers.