First of all, brew 1 tablespoon of hibiscus with 150 ml of boiling water. Beat eggs with sugar and vanilla in a fluffy foam. Add the butter and semolina and beat for a minute.
Pour in the cooled, strained karkade and mix. Add baking powder and flour. Beat for 15 seconds.
Add the blackberries to the dough and mix gently.
Put the dough in a 24-26 cm mold and send the pie to the oven for 45-50 minutes at 180 g. use a dry wooden skewer.