You will need 4x tart tins 3.5" diameter
Place all of the base ingredients into a food processor and process for 1-2 mins until it starts to stick together.
Split the base mixture equally between the 4 tart tins and press down using the under-side of a spoon and spread evenly until compact, ready for filling. Place in the fridge to set while you make the filling.
Wash out the food processor jug then place all of the filling ingredients (excluding the coconut flour) and blitz until smooth. Add the coconut flour if the mixture is too runny (this might happen depending on how ripe your mango and banana is). Process again until smooth.
Remove the tart bases from the fridge and spoon on the filling mixture, spreading evenly.
Chop the passion fruits in half then spoon the passion fruit on top of the tarts before placing in the fridge to set for about 1 hour.