Here is a recipe clipping from a magazine, date unknown but I don’t believe it’s more than 20 years or so old. Typed below as-is.

Dutch Chocolate Ice Cream

5 eggs
2 cups sugar
1 4-ounce package vanilla ice cream mix
1 recipe Chocolate Premix
4 cups whipping cream
3 cups milk
Dash salt

In large mixer bowl, beat eggs till light, about 5 minutes. Gradually add sugar and dry vanilla ice cream mix, beating till thick. Beat in Chocolate Premix. Stir in whipping cream, milk, and salt; pour into 5-quart ice cream freezer container. Freeze according to manufacturer’s directions. Makes 3 1/4 quarts ice cream.

To make Chocolate Premix: In saucepan, combine 2/3 cup Dutch process cocoa powder, 1/2 cup sugar, and 1 teaspoon ground cinnamon. Stir in 1 1/2 cups milk. Bring to boiling. Remove from heat; cool.