French Tarragon Burgers Recipe

In a small bowl, combine the mayonnaise, mustard, 1 teaspoon shallot, tarragon and garlic; cover and refrigerate. Meanwhile, cut bread into six 4-in. lengths (save remaining bread for another use). Cut bread pieces in half horizontally; set aside. Crumble beef into a large bowl; sprinkle with salt, pepper and remaining shallot. Shape into six patties. Grill burgers, covered, over medium heat for 6-8 minutes on each side or until a thermometer reads 160 ° and juices run clear. Grill bread, cut side down, for 1-2 minutes or until toasted. Spread with mayonnaise mixture. Layer bread bottoms with greens and burgers. Replace tops.