In a large bowl, whisk together 3 tablespoons white wine vinegar and the sugar until the sugar dissolves.
Place the potatoes in a large pot and fill the pot with cold water so that it is one inch above the potatoes. Set over high heat and boil the potatoes for 20-25 minutes, or until they are just tender when pierced with a fork.
Drain and put the potatoes into the large bowl with the vinegar/sugar mixture. Gently stir until the potatoes are coated with the mixture.
In a small bowl, whisk together the remaining 2 tablespoons white wine vinegar, garlic, onion, and Dijon mustard. In a slow stream, add the extra-virgin olive oil, whisking constantly. This will make an emulsification. Stir in the chopped thyme.
When the potatoes cool to room temperature, gently fold in the dressing. You may not need all of it. Taste as you go. Season with salt and pepper. Sprinkle ½ finely chopped red pepper on top and serve.
This potato salad can be made the day before. Just cover and refrigerate it. Bring it room temperature before serving.
Notes
Adapted from a Gourmet Magazine recipe.Please note that I am not a medical or nutritional professional. I provide nutritional information for my recipes as a courtesy to my readers. It is calculated using the WP Recipe Maker calculator. While I attempt to provide information that is as accurate as possible, you should calculate the nutritional information independently before relying on it.