Grilled Cauliflower Steaks

Name: Grilled Cauliflower Steaks
Ingredients: 1 tablespoon ground cumin; 1 tablespoon smoked paprika; 1 tablespoon ground coriander; 1 tablespoon dry mustard; 1 teaspoon onion powder; 1 teaspoon garlic powder; Pinch cayenne; Kosher salt and freshly ground black pepper; 1 large head cauliflower (about 2 1/2 pounds); 2 tablespoons olive oil; 1/2 cup Greek yogurt; 2 teaspoons chopped fresh oregano; 2 teaspoons chopped fresh mint, plus more leaves for garnish; 1 teaspoon honey; Juice of 1 lemon; 1 clove garlic, finely grated