2 medium yellow onions, halved and sliced thinly
1/4 cup white vinegar
1/2 cup olive oil
1 garlic clove, finely chopped
1 roasted red pepper, chopped
1 1/2 teaspoons salt
2 tablespoons sugar
1/2 teaspoon black pepper
Place potatoes in a large bowl. In a screw-top jar, add remainder of ingredients, cover with the lid and shake vigorously. Toss potatoes with dressing. Refrigerate overnight or at least a few hours. Adjust seasonings if necessary and serve at room temperature.