Cook potatoes in boiling, salted water with a teaspoon of vinegar, until tender. Drain and cool. Peel potatoes, cut into chunks. Separate egg yolks from whites. Set yolks aside. Chop whites and add to potatoes. Add onion.
In a small bowl, mash yolks, stir in mayonnaise, milk, vinegar, mustard, sugar and seasoning. Pour over potatoes; toss. Adjust seasoning, if necessary. Garnish with egg slices and paprika. Chill until serving.
Recipe Notes
Twist:Â Cranberry Pear, Pomegranate Quince, Jalapeno, or White Balsamic Vinegar
Preheat oven to 400º. Place flour, cornmeal and baking powder in a stand mixer bowl, fitted with the paddle attachment. Beat on low until combined. Add butter oil and 1/2 c yogurt. Beat until mixed. In a 9 inch tart pan, press the dough on the bottom and up the sides. Top with parchment paper and pie weights (or dry beans). Bake for 15 minutes. Remove the weights and paper and bake an additional 10 minutes.
Mix remaining ingredients in a medium bowl until smooth. spread evenly in the cooled crust. Slice tomatoes 3/8 inch thick and pat dry. Arrange on top of the filling. Bake the tart until the filling is set, approximately 25-30 minutes. Turn the broiler on, and brown the top. Let cool on wire rack. Sprinkle with salt and pepper and garnish with basil and Neapolitan Herb Balsamic vinegar.
