1 cup of sugar
3 egg yolks
3 heaping tablespoons of cornstarch
3 cups of milk, divided
3 tablespoons of butter, melted and cooled a bit
1 tablespoon of pure vanilla extract (learn how to make your own extract here.)
Put one cup of milk in heavy-bottomed pot on the stove over medium-low heat.
Put all other ingredients in blender jar. Blend until sugar is completely dissolved, which will take less than a minute. Mixture will be yellow and bubbly.
Add blended mixture to hot milk in the pot, and stir over medium-low heat with whisk until mixture thickens to pudding-like consistency. This will take several minutes, so be patient and DON'T walk away. If the custard scorches you'll have a weird taste and black flecks throughout the custard. Not good. When it begins to thicken, get your whisk going a bit faster, to really make it smooth and shiny.