Homemade pistachio pastry cream is indulgent and delicious. It has a rich crème pâtissière base, mixed with homemade pistachio paste and a hint of almond extract. Makes about 2.5 cups
1-2 teaspoonsneutral vegetable oil (only if needed, see notes)
Crème pâtissière
480gwhole milk
1vanilla beanscraped, or 2 teaspoons vanilla paste or extract
4largeegg yolks
65ggranulated sugar
30gcornstarch
1/4teaspoonsalt
45gunsalted butter
Instructions
Pistachio paste
Preheat the oven to 350°F (180°C). Fill a medium pot with water and bring it to a boil. Add the shelled pistachios and let them boil for about 2-3 minutes. 200 g raw shelled pistachios
While the pistachios are blanching, prepare a bowl of ice water. After they have blanched, drain the pistachios and immediately add them to the ice bath.
Once cooled, drain and tip them onto a clean kitchen towel. Use a second dry kitchen towel to rub the skins off.
Spread the peeled pistachios on a baking tray and toast in the oven for 8-10 minutes until fragrant. Let them cool until just slightly warm.
Add the cooled pistachios to a food processor and grind until they turn into a clumpy, fine meal. Add the powdered sugar and almond extract, if using, then keep processing until the oils release and it forms a smooth paste. This will take 10-15 minutes depending on your food processor. Stop and scrape down the sides as necessary. If it's not coming together after 15 minutes, add 1-2 teaspoons of neutral vegetable oil. 2 Tablespoons powdered sugar, 1/2 teaspoon almond extract
Scrape the paste into a jar. You'll use about half the paste for the custard. Save the rest in the fridge (up to a week) or freezer (up to 3 months).
Crème pâtissière
In a medium saucepan, heat the milk and vanilla on medium heat until just at a simmer. 480 g whole milk, 1 vanilla bean
While the milk is warming, add the egg yolks, sugar, salt, and cornstarch to a large bowl. Whisk until glossy and smooth. Place the bowl on a dampened kitchen towel. 4 large egg yolks, 65 g granulated sugar, 30 g cornstarch, 1/4 teaspoon salt
Pour the hot milk in a steady stream into the egg mixture while whisking constantly.
Add half the pistachio paste and whisk well to combine. Save the rest of the paste in a jar in the fridge (up to a week) or freezer (up to 3 months).
Return the mixture to the saucepan over medium heat. Cook, whisking constantly, until it starts to bubble. Once bubbling, keep it at a boil and whisk for a full minute until super thick.
Take it off the heat and whisk in the butter until smooth. Add a drop of food coloring for a more pronounced green, if desired. 45 g unsalted butter
Pour the pastry cream into a clean bowl. Lay plastic wrap directly onto the surface and let it cool to room temperature, then refrigerate until completely cold.
Notes
Measurements: Both grams and US cup sizes are provided. Use the toggle on the recipe card to switch between the two.
Cook it long enough. Once the custard thickens and bubbles appear, cook and whisk for a full minute. This deactivates amylase, an enzyme in egg yolks that can cause the custard to go soupy.
Store-bought pistachio paste. You can substitute the pistachios with around 100g store-bought pistachio paste, adjusted to taste. This will make a smoother custard.
Leftover paste. The paste recipe makes more than you need for one batch of custard (you use half and save the rest), which gives the food processor enough volume to work with. Save the rest in a jar in the fridge (up to a week) or freezer (up to 3 months).
Storing. Pistachio crème pâtissière can be stored in the refrigerator in an airtight container for up to 3-4 days.
Crème pâtissière is the base of this recipe. See that post for a full guide on making vanilla pastry cream.