Prepare your ice cream bowl according to the manufacturer’s instructions by chilling it for 24 hours beforehand or however long is recommended. If you have the option to change the freezer’s temperature, it should be at least -18 °C or -.4 °F. If you can get it even colder, that’s even better.
To a medium saucepan over medium heat, add 1 cup heavy cream (ignore that it says 2 cups below - that's a technical issue I can't fix), sugar, egg yolks and salt. Stir constantly with a wooden spoon until it coats the back of the spoon and registers about 170 °F (77 °C) on an instant-read thermometer. This will take about 4-7 minutes. Be careful not to boil the mixture. The coagulation temperature is about 180 °F (82 °C), so keep an eye on it. One time I made this, my mixture had some tiny eggy bits, but they were removed when straining later on.
2 cups (473 ml) heavy cream, divided, 1/2 cup (100 grams) granulated sugar, 4 (72 grams) large egg yolks, 1/8 teaspoon salt
Remove from the heat and stir in the vanilla and milk.
1 teaspoon vanilla extract, 1/4 cup (60 ml) whole milk
Mix in the raspberry preserves and the remaining 1 cup of heavy cream.
Set a fine-mesh sieve over the mixing bowl and strain the ice cream through the sieve.
Let come to room temperature, cover, and refrigerate the mixture for 8 hours or overnight so that it’s thoroughly chilled. I actually only chilled it for 3-4 hours, and it was definitely enough, but 8 hours is safer.
Pour into the totally frozen ice cream bowl and churn according to the manufacturer’s instructions. The ice cream will be like soft serve straight from the machine.
Transfer the churned ice cream to a shallow, freezer-safe container. A wide, flat container helps the ice cream freeze faster and more evenly, preventing large ice crystals from forming. Press a piece of plastic wrap or wax paper directly onto the surface to prevent freezer burn, then cover with a lid. Store in the back of the freezer, where the temperature is most stable. While safe for months, it is best enjoyed within 2 weeks for the creamiest texture.