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Crank your oven to its highest setting.
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Line a large baking tray with paper and drizzle on some oil to stop your Okonomiyaki from sticking.
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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.
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Pop the Okonomiyaki in the oven (don't wait for it to fully preheat) and set your timer for 10 minutes.
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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.
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Stack your Okonomiyaki on a plate. Drizzle over mayonnaise and sprinkle with extra sesame seeds or furikake (pictured).