Soak the red lentils in plenty of water for 12 hours, then drain well.
Preheat the oven to 180°C / 350°F.
Add the soaked lentils, eggs, ricotta, milk, olive oil, baking powder, salt and pepper to a blender. Blend until completely smooth.
Fold in the olives and cubed feta.
Pour the batter into a loaf tin lined with parchment paper.
Bake for 55-60 minutes, or until golden and a skewer inserted into the center comes out clean.
Let cool before slicing.
