Place 250g of dates into TM bowl and chop 4 seconds / speed 7
Put dates into a pot and repeat with the other 250g so you now have 500g dates in the pot
Add water and bicarb soda to the pot
Bring to the boil stirring lightly, and as soon as the mix bubbles take pan off the heat and add the butter and stir until the butter is melted
Set a timer for 30 minutes and prepare the rest of the cake ingredients
Heat oven to 150 degrees fan forced and place rack into middle
Line 24cm round cake tin (base measurement) with baking paper, and place onto baking tray
Put sugar, eggs, flour and vanilla essence into a large bowl and mix together (it will be clumpy but will smooth out when you add the date mixture)
When the date mixture has cooled for 30 minutes, add to sugar mix and lightly stir through … I do this with a large whisk (do not beat) as I find it helps to incorporate the ingredients together, but use a large spatula or spoon if you prefer
Pour mixture into cake tin, even surface with your spatula and bake 1 hour and 30 minutes
Test with a skewer and if necessary add another 10 minutes (sometimes I have to cook it for another 10 minutes so use your own judgment on this)
Let the cake rest for 15 minutes, and then turn out onto a cake rack to cool