Spicy Grilled Cauliflower Steaks

Name: Spicy Grilled Cauliflower Steaks
Ingredients: ½ cup olive oil, plus more for grill; 1 large head of cauliflower (about 2½ pounds); 2 canned chipotle chiles in adobo, finely chopped, plus 3 tablespoons adobo sauce; 6 garlic cloves, finely grated; 6 tablespoons sherry vinegar or red wine vinegar; 3 tablespoons mild-flavored (light) molasses; 2 tablespoons Diamond Crystal or 1 tablespoon plus ½ teaspoon Morton kosher salt; 2 tablespoons paprika; 1 tablespoon dried oregano; Lemon wedges (for serving)