Heat a grill to medium high. Remove the green outer leaves from a head of cauliflower. Cut two - 1 inch steaks from the center of the head, through the stem, being sure to leave the stem intact.
Trim the rounded outer edges from the remaining ends and use a skewer to thread though the thicker pieces, creating a (pieced together) steak. Repeat with remaining piece.
Whisk together the lemon zest, juice, garlic powder, red pepper flakes, salt, pepper, herbs and oil. Lay the steaks on a sheet or plate and brush lightly with 1 Tbsp. olive oil.