Crank your oven to its highest setting.

Line a large baking tray with paper and drizzle on some oil to stop your Okonomiyaki from sticking.

Squeeze the spinach to remove any excess moisture then mix the eggs, spinach, sesame seeds and a pinch of salt in a small bowl. Pour the mixture onto the tray into two lumps then smooth it with a spoon to create 2 circles about 16cm (6in) diameter.

Pop the Okonomiyaki in the oven (don't wait for it to fully preheat) and set your timer for 10 minutes.

When the timer goes the Okonomiyaki should be firm in the middle. If it's still a little runny, give it a few more minutes.

Stack your Okonomiyaki on a plate. Drizzle over mayonnaise and sprinkle with extra sesame seeds or furikake (pictured).