While the liquid heats up, whisk the egg yolks with the remaining sugar. You want to whisk it until the mixture turns pale yellow, becomes thick, and forms a ribbon when dripped on itself. (You can use an electric mixer with the whisk attachment if you are feeling lazy.)

Once the liquid mixture comes to a simmer, turn the heat off and let it sit for a minute or two. With the bowl holding the egg/sugar mixture secure on the counter (if no one is around to hold it, place it on a rubber mat or wet a dishtowel and wrap it around the base of the bowl), slowly pour the heated liquid mixture into the eggs, whisking constantly. Once fully incorporated, pour the contents of the bowl back into the saucepan. Over a medium-low heat, stir the mixture constantly with a wooden spoon until it reaches 185°F or a line holds when you drag your finger across the back of the wooden spoon. (It should only take a minute or two reach the correct temperature.)