Food & Cooking Recipes Salad Recipes Tricolor Salad 4.3 (3) Add your rating & review By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on February 5, 2018 Print Rate It Share Share Tweet Pin Email Servings: 4 Ingredients 1 tablespoon white-wine vinegar 1 teaspoon Dijon mustard Pinch of sugar 3 tablespoons olive oil Coarse salt and freshly ground pepper 1 endive, thinly sliced crosswise ½ head radicchio, cut in half and thinly sliced 2 cups loosley packed arugula Directions Whisk together white-wine vinegar, mustard, and sugar in a large bowl. Slowly whisk in olive oil; season with salt and pepper. Add endive, radicchio, and arugula, and toss until well combined. Rate it Print