Romaine and Broccoli Salad with Roasted Garlic Dressing

Bahan-bahan (10 porsi)

• 2 heads garlic, (unpeeled)
• 1 tablespoon olive oil
• 1 cup mayonnaise
• ½ cup buttermilk
• 2½ tablespoons minced fresh chives
• 1 tablespoon freshly squeezed lemon juice
• 1¼ teaspoons celery salt
• ¼ teaspoon freshly ground black pepper
• 3 whole hearts of Romaine, (torn into pieces)
• 1 pint grape tomatoes
• 1½ cups small broccoli florets
• 1 small English hothouse cucumber, (thinly sliced)
• 8 ounces thinly sliced mushrooms
• 1 small red onion, (sliced thinly)