Grilled Cauliflower Steaks With Herb Sauce

FOR THE HERB SAUCE:1 cup packed parsley1 cup packed cilantro½ cup olive oil1 lime (juiced2 tablespoons chopped red onion¼ teaspoon red pepper flakes½ teaspoon ground pepper½ teaspoon sea salt)

FOR THE "STEAKS":1 large head cauliflower½ teaspoon cumin½ teaspoon chili powder2 tablespoons chopped cilantroSalt and pepper (to taste)