Method
Remove the passion pulp from the 8 of the fruits, sieve to get the passion juice.. Mix the juice with the buttermilk and keep aside.
Beat the butter and sugar until Fluffy, and one egg at a time and continue beating, put the lemon rind and mix..
Add the flour alternating with passion butter milk mixture... Fold in 2 tbsp of passion fruit. Bake at a preheated oven 180°c until done.