Step 1Whisk together the vinegar, sugar, mustard, shallot, Champagne, salt and pepper. Slowly whisk in the grape seed oil.
Step 1Clean the chicken breasts and remove the excess fat. Combine the tarragon, parsley, garlic, olive oil and salt and pepper to taste in a bowl. Add the chicken and turn to coat. Marinate for 30 minutes in the refrigerator.
Step 2Heat a medium oven-proof skillet on medium heat. Remove the chicken from the marinade and sear on both sides until golden brown. Place the skillet in a 350-degree oven and bake until cooked through, about 7 to 10 minutes. Remove the chicken from the oven and cool. Cut into half-inch cubes.
Step 3Put the whole apples in a baking dish. In a bowl, mix together the honey, spices and walnuts. Spoon the coated nuts onto a cookie sheet. Bake the apples and the nuts for 15 minutes in a 350-degree oven.
Step 4Remove the apples and nuts from the oven. Place the walnuts in a bowl. Cool the apples, then peel, core and thinly slice them the short way.
Step 5Divide the lettuce and radicchio among four plates.
Step 6Heat a large skillet on medium heat and add the chicken, apples, walnuts, and half of the vinaigrette. Heat through. Spoon over arranged lettuces and top each with cheese. Serve the remaining dressing on the side.