1. Whisk the mustard and vinegar in a large bowl, season with 1/2 teaspoon salt and 1/4 teaspoon pepper. Gradually whisk in the olive oil. Season the cutlets with some salt and pepper and put in a large non-reactive glass or ceramic bowl. Pour about a 1/4 cup of the dressing over the cutlets and turn to coat evenly. Cover and marinate for 15 minutes at room temperature, or in the refrigerator for up to 8 hours.
2. Add the beans, corn, and tomatoes to the remaining dressing. Season the salsa with salt and pepper and toss to coat evenly. Add the avocado and cilantro and gently mix, taking care not to break up the avocado.
3. Preheat a stovetop grill or grill pan on medium-high. Drain the cutlets and grill until lightly browned and firm to the touch, about 3 to 4 minutes per side. Serve hot with the salsa.
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