Method

Combine the chocolate chips, heavy cream, corn syrup, butter and 1/8 teaspoon salt in an 8-inch cast iron skillet (see Cook's Note). Put over medium heat. Stir periodically as the mixture comes to a gentle simmer. Simmer for 6 minutes, stirring frequently, until the sauce is smooth and slightly thickened. Turn down the heat if the sauce comes to a full boil. Remove from the heat and let cool at least 15 minutes.

Preheat the grill.

Cover the fudge sauce with a single dense layer of marshmallows. Place under the broiler and broil until the marshmallows are toasty brown, 2 to 3 minutes (watch carefully as they may brown more quickly depending on your broiler.) Serve right away with dippers.

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From Food Network Kitchen