Serves 6 Ingredients: 1 pink grapefruit 2 teaspoons champagne vinegar 1/4 cup sour cream 1 teaspoon Dijon mustard 1/4 teaspoon kosher salt 1/4 teaspoon freshly ground white pepper 1/4 cup extra virgin olive oil 2 heads Belgian endive (red or white), leaves coarsely chopped (4 cups) 2 heads frisée, leaves torn into bite-size pieces (2 […]