Grilled Mustard-Dill Burgers
Heat barbecue. Mix first three ingredients in medium bowl. Transfer three tablespoons of sauce to small bowl and reserve.
Add meat to remaining sauce in medium bowl and mix gently. Divide meat mixture into two equal portions. Flatten each to ½-inch thick patty; sprinkle with salt and pepper.
Grill cut side of buns until toasted, about one minute. Grill patties to desired doneness, about four minutes per side for medium.
Spread bottom half of buns with reserved sauce. Top each with burger, tomato slice, lettuce and bun top.