What makes this salad different is that the salad is served warm or at almost room temperature, although it is still great served chilled also, but plan ahead the salad needs to sit for about an hour or so before serving to blend flavors, try not to overcook the potatoes as they tend to fall apart easily when mixed with the dressing, when I made this the first time I used 1/2 cup vinegar but found it to be too much for my family's taste, making this again I used only 1/3 cup and that seemed to work fine, if you prefer a stronger vinegar flavor then increase the vinegar by 2-4 tablespoons, you may use all vegetable oil in place of the bacon grease.