In this tutorial you’ll learn to make delicious, creamy chocolate ice cream and we’ll compare two blade-driven ice cream machines: the Ninja Creami and the Pacojet.
Recipe
Formula (Ingredients):
125g sugar
20g malt powder
37g Dutch-process cocoa powder (natural cocoa powder will also work)
1.5g salt (anywhere between 1 – 2 grams is fine)
1/8 tsp espresso powder
160g whole milk (4% fat)
180g 1st cream (40% fat — see note below)
8 large yolks
85g corn syrup
60g bittersweet chocolate
600g 2nd cream (40%)
7g (1.5 tsp) vanilla
Notes on Cream/Milk Ratios:
Professional-grade heavy cream is typically 40% fat. Some grocery stores sell this, but many don’t, and the cream may not even say the fat percentage. 36% heavy cream is more commonly found at the grocery store, but some sell 33% fat or other percentages. If the heavy cream at your store doesn’t say what percent fat it is, don’t worry — it will work fine. In fact, you can use the recipe above with any type of heavy cream, and it will be OK, just not as rich.
If you want to keep the fat percentage the same as I use, substitute these amounts for ones given above:
- For 36% cream: use 108g milk, 232g 1st cream, and 600g second cream.
- For 33% cream: use 64g milk and 276g 1st cream, and 600g second cream.
Method (Instructions):
Whisk your dry ingredients together (sugar, malt powder, cocoa powder, salt, and espresso powder) in a bowl to make clump less when you mix them into the liquid ingredients.
Measure these liquid ingredients directly into your pot (milk, 1st cream, egg yolks, and corn syrup). Measure your 2nd cream (600g) into a separate container and reserve. Also measure out your bittersweet chocolate* and vanilla extract. You’ll be using all three of these at the end of recipe.
Now whisk together your dry ingredients with the wet ingredients you measured into your pot while it is still cold. Then, on medium heat, cook while continuously whisking until the cocoa powder has melted (above 100°F / 38°C). At that point, switch to a silicon spatula and continue to cook on medium heat, continuously stirring and scraping the sides and bottom of the pot, until it reaches just above 180°F / 82°C. Once it does, turn off the heat and give it a few more stirs, again scraping the sides and bottom.
Now remove from the heat and drop in your chocolate. If you cut it into small pieces it will melt more quickly and easily. Stir until it has completely melted (3-5 minutes), then add in the reserved 600g cream and the vanilla extract and stir until smooth.
Optional: Straining Your Custard
At this point, you can strain your mixture through a fine-mesh strainer or use an immersion blender to blend out any small bits of egg that have coagulated. There will always be some no matter how good of a job you did because the chalazae from the eggs (the part of the white that holds the yolk in the center) will always make little lumps. If you didn’t stir enough or heated the custard too quickly, you may end up with little bits of overcooked egg as well, so it’s always a good idea to strain it.
In this video I don’t bother straining it or using an immersion blender because I’m going to process it in a blade-driven ice cream machine, so any lumps will be pulverized in that process. But if you did overcook any of the egg, it’s a good idea to get it out anyway for the best flavor.
Options for Ice Cream Machines
Ninja Creami: If you want to use the Ninja Creami shown in the video, it’s best to chill your ice cream in the fridge for 4-8 hours, give it a stir, then freeze it at least overnight, but preferrably for 24 hours.
Purchase the Ninja Creami: https://amzn.to/43JVI77
Churning Machines with Gel Cylinder: Chill for 4-8 hours, then process in your machine
Churning Machines with Built-In Compressor: Optionally chill for 4-8 hours, but you can also just pour the warm custard directly into the machine and process it immediately.
Purchase the Breville: https://amzn.to/44i1qgD
Note: these are affiliate links, so our non-profit may receive a small amount of money when you purchase, but it won’t affect the price you pay.
Additional Science Notes
Ice cream is a complex, multi-phase system that can be classified in several ways. It is:
- A partially solid foam (air bubbles dispersed in a frozen matrix that includes both solid ice and liquid water).
- An emulsion (fat droplets dispersed in water, which are stabilized by lecithin from the egg yolks).
- A colloid (a fine dispersion of multiple phases, including fat, ice, and air).
- A suspension (solid ice crystals and proteins suspended in a liquid phase).
- A gel-like system (due to heat-coagulated egg proteins, which thicken the base and bind water, while lecithin acts as an emulsifier to stabilize fat dispersion).
- A phase-change material (see below).
Sugar lowers the temperature of fusion (freezing temperature) of water. The more sugar that’s in ice cream, the softer it will be. As water freezes, it pushes out impurities so it can form pure crystals. The remaining liquid water becomes more concentrated in sugar, further lowering its freezing point.
Because of this, there is always liquid water in ice cream.
If you’d like to learn more about food science, please consider taking our ACF Food Science Specialized Certificate course, which can be found here.