Break the eggs into a small bowl before whisking together with a fork. (Make sure you are using room temperature eggs). Now find a heat-save bowl (glass, metal or ceramic), that will sit nicely on top of a cooking pot without touching the bottom of the pot. (Known as a double boiler or bain marie ). Remove the bowl, add in about 1 - 2" (2½-5cm) level of water to the bottom of the pot, heat on medium heating & allowing to start to come to a boil.
Move your pot onto a smaller ring, intended for cooking with a smaller sized pot, and turn the heat to medium for the water to gently simmer. (Changing rings is a very good idea if you have trouble making curd or worry about scrambling the eggs. By heating on a ring that is a bit small for your cooking pot, this will ensure the eggs don't get cooked too quickly.)
Now sit the heat-save bowl on top of the pot of water & add the brown sugar, ½ tsp anise, 1 tsp ginger & 1 tsp Cinnamon to the bowl & whisk/mix together by hand.
Next add in the pureed figs that will have cooled a little, and mix till fully combined. Then add in the whisked eggs, gradually, in increments of about 2 or 3, whisking well in-between each addition. Make sure your water is not boiling, & not bubbling up the pot. If it does get too hot (which is less likely, reduce the heat to low).
Whisk the mixture for about 2 minutes by hand or with a hand-held electric whisk. Most recipes will now have you whisk continually by hand or at least hold an electric whisk, for at least fifteen minutes. But my hands get tired easily, so I found a way to reduce the amount of time needed to mix. Using a hand-held electric mixer, attach the dough hooks it comes with (see photo ). If you have an immersion/stick blender that also has a 'balloon style' whisk attachment, use that. Add in one cube of the butter at a time, & mix gently with a wooden spoon, let the heat melt the butter. Then turn the machine on, let it mix the curd on a moderate setting for 10 seconds. Add in another cube of butter and mix a little by hand until it melts. Repeat the 10 second mixing with the machine, alternating with adding the cube of butter.
Don't let the dough hook attachment mix for longer than 10 seconds at a time (you don't want to blow the motor on your machine). The idea is to cook on very low, for longer, but with less constant mixing, which also allows the mixture to thicken more naturally, as well as reduce the chances of scrambled eggs.
In-between the adding butter and mixing, every so often check the thickness of the curd with your wooden spoon. Mix through the curd to see the thickness and when you think it might be thick enough, test by submerging the business-end of the spoon in the curd, turning it over to let the curd coat the back of the spoon. At the beginning the curd would have ran off the back of the spoon but once it stays longer and coats it - do the test.
Run your finger, or better still the end of a small spoon (as the mixture will be hot), through the curd coating the back of the spoon and try and draw a clear line through it. This line should show the thickness of the curd - is it clear definition between the exposed wood of the spoon, where you scraped it, and where the curd still remains? Or is it less defined because the curd is not thick enough and more liquid state? Get in the habit of checking during the mixing stage so you will become accustomed to what it should look like. (See photo below).
Once thick enough with the clear line, (note you don't need it to be really really thick & set now, as it will continue to thicken off the heat & on chilling), remove from the heat & remove the bowl from the cooking pot. Let it cool a few minutes before adding anymore of the anise & other spices. Add in ¼ tsp of Mixed Spice/Pumpkin Spice, ¼ tsp Ginger & another ¼ tsp anise. Mix thoroughly before having a taste test. Add in more anise by the ¼ tsp until you are happy with the level of anise. If not as keen on anise, you can alternatively add small amounts of ginger, cardamom, or nutmeg.