A 1977 Sanders advertisement in The Detroit News touted that the hot fudge was made with butter, cane sugar and chocolate.

Melt butter or margarine with chocolate over lightly boiling water. Mix in sugar and milk. When combined, add vanilla. To prevent grainy texture, be sure to heat sufficiently so sugar crystals melt.

Wait for it to cool for 2 minutes before turning out. Next make the fudge sauce. Combine and melt the butter, sugar and lemon juice. Stir and pour over the cake when it’s cool. Preheat the oven ...

Add the nuts to the melted chocolate mixture and stir well. Pour the mixture into a 23cm/9in square tray, smoothing the top with a wet palette knife. Let the fudge cool, then refrigerate until set.

which will help to lighten the mouthfeel of the fudge. You'll want to let the sauce cool slightly for this recipe, as adding it hot to the blender would cause it to melt the ice cream and turn it ...