Step 1: Preheat the oven to 425°F (220°C) for caramelization.
Step 2: Toss cauliflower with harissa paste and olive oil in a mixing bowl and spread on a baking sheet.
Step 3: Roast for 20-25 minutes until golden brown, stirring halfway.
Step 4: Blend avocado, yogurt, cilantro, lemon juice, and scallions in a food processor until smooth, adding water as needed.
Step 5: Combine mixed lettuce and freekeh in a bowl, add roasted cauliflower, feta, scallions, and dressing, then toss gently.
Step 6: Adjust seasoning if needed, serve immediately or chill briefly.