In a medium bowl, whisk together lemon juice, olive oil, garlic, ketchup, steak seasoning, black pepper, red pepper and parsley.
Add chicken to a 1-gallon freezer bag. Reserve a small quantity of marinade for basting, if desired, then pour marinade over chicken. Marinate chicken in the bag for at least 30 minutes or overnight or press out air from the bag and freeze.
In a small bowl, whisk together mayonnaise, chopped tomatoes, chopped basil, salt and pepper. Refrigerate until ready to use.
Thaw if frozen. Grill 7-8 minutes per side, basting with additional marinade, if desired, until internal temperature reaches 165ºF. Alternatively, place chicken in a casserole dish and bake at 400ºF for 30-40 minutes, until temperature reaches 165ºF.
Serve chicken on a Magic Hamburger roll with arugula and tomato basil mayo.