Chocolate ice cream recipe

4 egg yolks, lightly beaten
1 cup sugar
2 cups table cream (18% milk fat)
1 1/2 cups milk
1/2 cup cocoa powder (sifted)
2 tsp pure vanilla extract
Beat egg yolks lightly. Beat in sugar. Heat the cream/milk on the stove. As it's heating, beat in cocoa powder.
Heat cream/milk/cocoa mix until steaming. Stir into egg/sugar mix. Add vanilla extract. Cool. Freeze in ice cream
maker.
Notes:
I use Dutch processed cocoa (instead of American processed), but I'm not sure how much difference it makes.
I've tried using a higher milk fat content, but then the mix takes on the consistency of pudding when cooled, and
doesn't freeze hard enough in ice cream maker.