Eggnog
A proper cooked custard rather than raw eggs whisked into cream — the yolks are tempered into hot dairy and taken to 160°F, which makes it both safe and silky. Be realistic about the timing: it needs at least two hours in the fridge before it is worth drinking, and overnight is better.
At a glance
Ingredients and method are in the app
Kitchen Pantri holds the full ingredient list and step-by-step method for Eggnog, checks it against what is already in your pantry, and adds anything missing to your shopping list. The app is free to use; you set up a Pantri account when you first open it.