Cauliflower "Steaks" with Mexican Chimichurri

Ingredients

• 3 tablespoons olive oil
• 3 cloves garlic
• Salt and black pepper
• 1 teaspoon kosher salt
• ⅓ cup olive oil
• ½ cup chopped white onion
• 2 heads cauliflower
• Chimichurri
• 2 tablespoons each fresh lime juice and red wine vinegar
• 1 cup each fresh cilantro and parsley
• ¼ cup oregano or mint
• 1 Serrano or jalapeno ribs and seeds removed, (chopped)
• 1 teaspoon fresh lime zest
• Cauliflower Steaks