Potato salad may never be the same after you make it in a slow cooker. Crispy bacon adds flavor and texture to this summertime staple.
Whisk 2 cups water, 1/4 cup of the vinegar, 1 tablespoon of the honey, 1 tablespoon salt and 1/2 teaspoon pepper in the insert of a 6-quart slow cooker. Add the potatoes and stir to combine. Cover with a lid and cook on low heat until the potatoes are tender but not falling apart, about 4 hours.
Turn off the heat and drain the potatoes well. Transfer the potatoes back to the slow cooker insert and cover with a lid to keep warm.
Add the bacon to a large skillet set over medium heat. Cook, stirring, until the bacon is brown and crispy, 4 to 5 minutes. Remove the skillet from the heat and use a slotted spoon to transfer the bacon to a paper-towel-lined plate. Discard all but 4 tablespoons of the bacon drippings. Add the mustard, the remaining 1/2 cup vinegar and 1 tablespoon honey to the skillet and whisk. Pour the dressing in the slow cooker along with half of the bacon and the scallions, reserving 2 tablespoons for topping. Gently stir to combine, and season with additional salt and pepper if needed. Transfer the potato salad to a large serving platter or bowl and top with the remaining bacon and reserved scallions to serve.