3/4 cup mayonnaise
1/4 cup sour cream
2 teaspoon white vinegar
1/4 teaspoon dried basil, crushed
1/8 teaspoon garlic powder
3 tablespoon grated Parmesan
1/2 teaspoon cracked peppercorns
1 to 2 tablespoon milk (optional)
Mix together all ingredients. Cover and store in refrigerator up to 2 weeks. If necessary, stir in milk to get desired consistency.