Unsweetened chocolate, sweetened condensed milk, vanilla, water and a pinch of salt all melt together to form a sweet, simple fudge sauce. Unsweetened chocolate, sweetened condensed milk, vanilla, water and a pinch of salt all melt together to form a sweet, simple fudge sauce. Unsweetened chocolate, sweetened condensed milk, vanilla, water and a pinch of salt all melt together to form a sweet, simple fudge sauce.