Place the butter in the bowl of a stand mixer that has been fitted with the paddle attachment (this can easily be done by hand or with a hand mixer). Add the golden syrup, salt, orange blossom water (if using), vanilla seeds, and vanilla extract. Mix on medium-low to combine. Scrape down the sides of the bowl with a rubber spatula to make sure everything is mixed well.
Turn the mixer to low and slowly add the powdered sugar. Mix until completely smooth, scraping down the sides of the bowl as necessary.
Place one third of the mixture into a small bowl and add enough yellow food color to obtain desired color.
Cover both bowls with plastic wrap and put into the freezer for at least 15 minutes. It is necessary that this mixture be very cold while you work with it.
When the sugar mixture is thoroughly chilled, remove from the freezer. Working quickly take about a half teaspoon of the “yolk” mixture and roll it into a ball. Continue forming your yolks.
Once the yolks are complete, place them on a plate or a sheet tray covered with parchment and then put that back into the freezer.
Now, measure a tablespoon of your “whites”, and then roll that into a ball. Continue until all the white portion of the sugar mixture is gone. If the whites are too soft to work with, place back into the freezer for a few minutes.
Remove the yolks from the freezer. Place a white in the palm of your hand and gently flatten a bit. Create an indent in the center to rest the yolk in. Place the yolk in the center of the white, then cover it up. Roll the white into an egg shape. If at any point the sugar mixture gets too soft, quickly put it back into the freezer.
Continue this process until all your eggs are complete. Return to the freezer.
While your eggs are chilling, temper your chocolate (David Lebovitz has a great post on tempering chocolate).
Or melt the chocolate in a microwave at 30 second intervals stirring very well in between. Add 1 tablespoon canola oil to the chocolate and stir well. This gives you a little more flexibility with the chocolate eliminating some of the need for precise tempering. You will not, however get as nice of a crack as you bite into the egg.
Working with one egg at a time, remove the egg from the freezer and stick a toothpick in it. Dip the egg into the chocolate and carefully let the excess chocolate drip off. Place the toothpick into something – like a potato perhaps – while the chocolate sets.
Place the chocolate-covered egg into the fridge for 10 minutes while the chocolate sets.
Carefully remove the toothpick from the egg and cover up the small hole with a little bit of tempered chocolate.