Boil water in a heavy set pot, or set up your double broiler. In a separate bowl, beat the eggs. In an additional bowl, get all the juice from the oranges. Zest all of the oranges, and add it to the bowl with the juice. Lastly, add the sugar to the bowl with the juice and the pulp.
Once the water is boiling, place your heat safe bowl on top of it. Make sure the no water is touching the bottom of the bowl. Allow the butter to melt, meanwhile stirring. Once the butter has melted, lower the temperature to medium. Slowly drizzle in your eggs and whisk constantly. This will prevent any curdling of the eggs *
You are going to need to whisk the mixture constantly for around 15 minutes until it becomes nice and thick. Once it reaches that consistency, grab a sieve and a bowl, along with a spatula. Pour the curd through the sieve to make sure you don't end up with any grainy bits in the curd. Once the good curd has been separated, place in storage containers, and place into the fridge. Allow it to cool before using / serving.
Video
Notes
Watch the video instructions here : https://www.youtube.com/watch?v=T_-2rwZ-iHE