Makes 1 cake of 10 x 20cm – Oven: 1 hour
Preheat the oven to 180°C fan.
Defrost the spinach in a microwave and squeeze out all the liquid. Roughly chop the spinach and set aside.
In a large bowl, mix the sour cream with an egg until smooth. Add the remaining two eggs, one by one, and whisk. Add the milk and olive oil, lemon zest and whisk until smooth.
In another bowl, mix the flour with the baking powder, salt, nutmeg, garlic granules and pepper. Add everything to the liquid mixture and mix. Add the Gruyère, pumpkin seeds, flax seeds, poppy seeds and black sesame seeds as well as the chopped spinach and mix until evenly distributed.
Cut the feta into cubes and gently fold them into the batter.
Grease a 10 x 20 cm cake tin and pour the batter into it. Sprinkle with the seeds for the topping and bake the cake in the preheated oven for 1 hour.
Let the cake cool on a wire rack before unmolding it.
The cake will keep in the fridge for 4 days.