Trim stem and remove green leaves from cauliflower. Lay veggie flat on a cutting board (stem side down). Cut small portion off two sides, then slice to create 3 to 4 "steaks" about 3/4 inch thick. Save remaining florets for another recipe. Place "steaks" on a lined sheet pan and set aside.
Zest 1 of the limes into a small bowl. Add olive oil, 1/4 cup lime juice, honey, chile and garlic powders, salt and cumin. Whisk together and baste the tops of each of the cauliflower steaks.
Place cauliflower steaks on the grill and baste tops before closing lid. Grill for 5 minutes. Use tongs to carefully turn cauliflower steaks over. Continue grilling another 5 minutes. Baste with any remaining chile sauce.
Serve with chopped cilantro and lime wedges. Great as a main or side vegetable.