Buffalo Burgers with Fresh Garden Herbs and Huntsman Cheese Recipe

Name: Buffalo Burgers with Fresh Garden Herbs and Huntsman Cheese Recipe
Ingredients: ¾ cup mayonnaise; ¼ cup sour cream; ½ cup minced fresh flat-leaf parsley; 1/3 cup chopped fresh chives; 2 teaspoons chopped fresh tarragon; 2 teaspoons minced garlic; 2 teaspoons chopped anchovy fillets; 1 ½ pounds ground buffalo (bison); ½ pound ground beef chuck; ¼ cup thick-and-creamy-style horseradish; ½ cup grated red onion; 1 ½ teaspoons salt; 12 ounces Huntsman cheese (Stilton layered with double Gloucester), cut into 6 equal slices; 6 cracked-wheat hamburger buns, split; 6 tablespoons honey mustard; 4 cups coarsely chopped European-style salad mix (mesclun)