Mix all the ingredients apart from the butter until homogenous. Whisk continuously while cooking over low heat until thickened and starting to boil. Whisk in the butter until fully incorporated.
Chill down in the fridge immediately, covered with a piece of parchment or food safe plastic to avoid a skin from forming.
Notes
Substitutions
Lactose-free — Use lactose-free milk and cream.
Dairy-free — Replace the milk and cream with coconut milk or nut milk.
Sugar-free — Use a small amount of stevia or artificial sweetener.
Top tips for success
Mix your ingredients well to ensure even cooking.
Continuously whisk to avoid it catching on the bottom of the pan and uneven cooking.
Storage instructions
Homemade custard should be stored in the fridge. It will only last for 3 days. It's not suitable for freezing.
Make sure to place a piece of parchment or food-safe plastic directly in contact with the custard to prevent a crust or skin from forming on the surface.