Beat the egg yolks in the bowl or your stand mixer or in a bowl using a hand mixer. Ideally, beat for 20 minutes until they are very pale, fluffy, and creamy. If you are using a hand mixer, beat for several minutes for pretty good results.
If you are adding flavoring, add that now. Vanilla is good, and lemon juice is also tasty. If you try chocolate, use about 2 T cocoa or cacao powder. Add more honey if needed.
Finally, beat in 1 C cultured cream (or sour cream if not on the GAPS diet) enough to mix.
Pour the custard into 4 serving bowls and freeze for a couple of hours.
If your custards freeze hard, let them sit for 10 minutes or so at room temperature, and you will be able to eat them then!