For the DressingCombine all ingredients in a high-powered blender and puree until smooth. Dressing will keep tightly sealed in the refrigerator up to 3 days.Roasted CabbageMake Caesar dressing and refrigerate. Preheat oven to 425 degrees F and line a baking sheet with parchment paper. Slice cabbage head into 8 equal parts, then gently place them side by side on baking sheet. Brush with olive oil and sprinkle with salt.Roasted wedges for 20-25 minutes, or until tender with golden brown edges. Serve wedges immediately with a generous drizzle of Caesar dressing. Squeeze on extra lemon juice, if using.