I've just made meringue for a Christmas pavlova (no I know, it's not very Christmassy, but we asked the kids what they wanted three years ago when they were 4 and it's sort of become a tradition) and I have 4 egg yolks left. WIBU to make some custard from them and have some panettone and custard this evening, even though it's not remotely Christmas yet and there's a tsunami of pudding coming at me from about Saturday onwards?