What is the difference between vanilla custard and vanilla pudding?
Custard is thickened primarily with egg yolks (often with dairy), which gives it a richer texture and deeper flavor. Many “puddings” are thickened mostly with starch. This recipe uses yolks plus a little cornstarch, so it lands firmly in custard territory with extra stability.
How do I keep custard from curdling?
Use medium heat, and once the mixture is steaming hot, whisk constantly. Temper the yolks (slowly whisk hot milk into yolks) and stop cooking once you see thick, slow bubbles. If you have an instant-read thermometer, aim for about 170°F to 180°F, knowing that curdling risk climbs as you approach the low-to-mid 180s depending on your ingredients and heat.
Does cornstarch guarantee it will not curdle?
It helps, a lot. Starch stabilizes the eggs and makes the custard more forgiving, but it is not magic. Medium heat, constant whisking, and pulling it off the stove as soon as it thickens are still the real safety net.
My custard has lumps. Is it ruined?
Not even close. Strain it through a fine-mesh sieve while it is warm. If it is still slightly lumpy, blend briefly and chill. It will be silky.
Why did my custard turn thin after cooling?
Usually it was not cooked long enough to fully activate the starch and set the yolks. Bring it to a gentle bubble and cook for 60 to 90 seconds while whisking, then pull it off the heat.
Can I make this ahead?
Yes. Custard is a great make-ahead dessert. Make it up to 2 days ahead and keep it chilled with the surface covered. It will thicken a little more as it sits.
How do I prevent a skin without plastic wrap?
Press buttered parchment directly onto the surface, or dust the top with a very thin layer of sugar before chilling. (Plastic wrap pressed to the surface is still the simplest option.)
Can I make this dairy-free?
You can, but it will taste different and can be a bit less plush. Use full-fat canned coconut milk (or a rich oat milk) and keep the cornstarch. Coconut milk brands vary a lot in fat, so expect the set to range from softly spoonable to a bit looser.