Finely grind the oatmeal.
In a large bowl, mix the eggs, olive oil, milk, and honey well.
Add the ground oatmeal, baking powder, and salt, and mix until well combined.
Add lemon juice and lemon zest to complete the batter.
Pour the batter into a pound cake pan lined with parchment paper.
Bake in a preheated oven at 180°C for 30-35 minutes.
After cooling completely, remove from the pan and serve.