Make the marinated steak: Mix all ingredients together in a large bowl. Toss to coat the steak in the marinade. Cover bowl and place in refrigerator. Let steak marinate for 30 minutes or up to 1 day.
Prep the ingredients per the instructions above.
Preheat a grill or grill pan on medium heat. Place the potato on the top rack of the grill or alternatively into a preheated oven at 400℉ (202℃). Bake for about 45 minutes or until tender.
Grill the corn on all sides until nicely charred and tender. Cut the corn kernels off the cob and place them into a bowl. Mix the remaining ingredients for the corn tomato salad with the corn. Season with salt and pepper.
Grill the steak on both sides to your desired temperature using a thermometer (see below). Set the steak aside to rest for 5 minutes before slicing thin against the grain.
Slice the potato in half. Season with salt and pepper; top with butter and sour cream.
Toast the bread. Spread with butter if desired.
Serve the steak with corn tomato salad, baked potato, and beer.