Summarize this article:

(28ml) of white vinegar, 1 tbsp. (14g) of Dijon mustard, 1/2 tsp. (2g) of salt and 1/2 tsp. (2g) of freshly ground pepper into a medium bowl.

Summary:
Place 1/3 cup (75.6g) of mayonnaise, 1/3 cup (75.6g) of buttermilk, 1/3 cup (75.6g) of plain yogurt, 2 tbsp. Whisk the ingredients together in the bowl until they are evenly incorporated and smooth. Add 1/2 cup (56.7g) of crumbled blue cheese to the smooth mixture. Smash the cheese with a spoon until it is evenly blended into the other ingredients.