Charred Cauliflower Steaks with Piri Piri Sauce

Ingredients

• 2 Tablespoons Aleppo chili flakes
• 1 Tablespoon cumin seed
• 1 Tablespoon coriander
• 1 Tablespoon smoked sweet paprika
• 1 1/2 Tablespoons kosher salt
• 2 Tablespoons white sugar
• 1 red bell pepper, coarsely chopped
• 3 garlic cloves
• 1/3 cup lemon juice (about 2-3 lemons)
• 1/4 cup red wine vinegar
• **1 cup fresh cilantro
• 1 large head of cauliflower, sliced into thick chunks
• 2 tablespoons extra-virgin olive oil, or more to taste
• 1/4 teaspoon garlic (optional)
• Salt
• freshly ground black pepper