Heat a grill or grill pan to medium-high. Char the corn all over, 5 to 10 minutes total. Scrape the kernels from the cobs and set aside.
In a small bowl, mix the coriander, paprika, grill seasoning and marjoram. Rub the steaks with the spice mixture. Grill, turning once, about 5 minutes on each side for medium. Let rest for 5 minutes. Slice on an angle against the grain.
In a medium bowl, mix the vinegar, oil and honey. Add the reserved corn kernels, the tomatoes, cucumber, butter beans, dill and chives. Toss and season to taste with salt and pepper. Serve the succotash alongside the steak.