Can I freeze custard? I have some spare egg yolks that I want to use and not throw away and I've decided to make some vanilla custard. But I have no use for the custard right now and might decide to make Portuguese tarts later.

So, is it possible to freeze custard and for how long will it keep? If yes, are there any tips to thaw it?
Custard does not freeze well, it has a tendency to separate. If you do freeze it, freeze it right away, leave it frozen for as little time as possible, and defrost it in the refrigerator. I wouldn't leave it in the freezer for more than a month.

One way to freeze custard and get great results is to make ice cream! If you have an ice cream maker, great. If not, that's OK too. Custard based ice creams get less icy than other types of ice cream when made without churning. Just thoroughly stir every half an hour while freezing for at least three hours.