White Barbecue Sauce

1 1/2 cups mayonnaise
1/4 cup white wine vinegar
1 garlic clove, minced
1 tablespoon coarse ground pepper
1 tablespoon spicy brown mustard
1 teaspoon sugar
1 teaspoon salt
2 teaspoons horseradish

Stir together all ingredients until well blended. Store in an airtight container in refrigerator up to 1 week.

Source: The Bitten Word, citing Southern Living