Add lemon zest and sugar to TM bowl and mill 10 seconds / speed 10
Scrape around bowl
Add lemon juice and eggs and cook 10 minutes / 85 / speed 3
NB: for a TM31 cook 8 minutes / 80 / speed 3, then 2 minutes / 90 / speed 3
While this is happening, place water for the gelatin in a small container and sprinkle over the gelatin powder, put aside until needed in the next step (whilst it is sitting the powder will be absorbed by the water into a solid mass)
Once filling has cooked for 10 minutes, scrape around bowl, add the softened gelatin and butter and blend 20 seconds / reverse / speed 3, scrape around bowl and repeat 10 seconds / reverse / speed 3 (I use reverse to minimise creating bubbles in the mix)
Pour filling onto the cooked base and level with a back of the spoon
Place tray back into the oven and bake for 10 minutes, turn tray around and continue for a further 10 minutes … the curd should look set around the edges with a slight jiggle towards the middle
Remove from oven and place onto bench top to cool to room temperature which will take at least two hours
Once completely cool, cover and place into the fridge overnight
Next day remove slice from the fridge, if there is any condensation on top of the slice, gently place kitchen paper on top of the slice and lightly run your fingers over the top to soak up the condensation (this can happen if the slice was still a little warm when you put it into the fridge)
Use the overhanging baking paper to help remove slice from tin and place onto a cutting board
You can now also use a metal slide to help lift the slice off the baking paper (I like to do this before cutting)
Portion into desired pieces (I make 24 pieces), and store in the fridge in a sealed container for up to five days
Dust with a little icing sugar before serving