01 -
Set your oven to 175°C (350°F) and let it heat up fully.
02 -
Butter up a 10-inch cake tin, then lightly coat it with some flour.
03 -
Mix together the flour, salt, and baking powder in a medium bowl.
04 -
Beat the butter and sugar together with a stand mixer until it’s fluffy and pale, around 5 minutes. Don’t forget to scrape the sides midway.
05 -
Pop in the eggs one at a time, giving it a good mix after each one.
06 -
Stir in the orange zest and the vanilla until everything's evenly mixed.
07 -
Gently fold the dry mix into the wet batter using a wide spatula. Don’t overwork it.
08 -
Pour the batter into the prepared pan and arrange the plum pieces on top. Bake for around 1 hour at 175°C (350°F). A skewer should come out clean when inserted in the middle.