"My husband is a grill master, and we like to make up recipes together. The sauce for this juicy burger tastes even better when it's been refrigerated overnight. —Mary Potter, Sterling Heights, Michigan..."
INGREDIENTS
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2 tablespoons butter
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1/4 cup mayonnaise
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2 tablespoons prepared horseradish
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2 tablespoons Dijon mustard
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1/8 teaspoon salt
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1/8 teaspoon pepper
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BURGERS:
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1-1/2 pounds ground beef
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1/3 cup beef broth
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2-1/2 teaspoons hamburger seasoning, divided
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6 hamburger buns, split
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3 tablespoons butter, softened
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Optional toppings: Shredded lettuce, sliced tomato and red onion