Aquaponics - Coz lettuce

My coz lettuce look fake.

I'm pretty sure they're not, because we eat them every day, but they look it.

In fact they look so fake I'm wondering if that's why the supermarket versions look the way they do.

Perhaps they leave out the iron or something in the plants diet so they look less like plastic lettuce and more like the lettuce I'm more familiar with.

My lettuce look so fake they actually look like a cross between spinach and cos lettuce.

But they really are cos lettuce.