To make the vinaigrette, in a small saucepan over medium-low heat, combine the vinegar and wine and bring to a simmer. Cook until reduced by half, about 3 minutes. Set aside to cool. In the bottom of a large bowl, using a fork, mix together the salt, the reduced vinegar and wine mixture, and the olive oil just to blend. Set aside.
Cut each endive in half lengthwise, and cut away the sol