01 -
Set the oven to 190°C and allow it to fully preheat.
02 -
Thoroughly grease a 23 cm pie plate with the softened butter.
03 -
Spread the diced rhubarb evenly over the base of the greased pie plate.
04 -
In a blender, combine the flour, granulated sugar, baking powder, salt, eggs, vanilla extract, and milk. Blend until smooth and homogenous.
05 -
Gently pour the custard mixture over the rhubarb in the pie plate, ensuring even coverage.
06 -
Bake for 40 minutes, or until the custard is set with a slight wobble in the center.
07 -
Let the custard cool for 10 to 15 minutes before slicing and serving.