Because I said tart pans have short walls, this is another reason why you should use a true tart pan - one with a removable bottom. Tart pans have straight sides, unlike pie pans that have slanted sides. So, it's very difficult to remove a piece or slice of the tart if the bottom isn't removable. You can't slide any sort of serving utensil easily into a pan with straight sides, it's very difficult. So, this is why ceramic tart pans are no good. While they look pretty, it's near impossible to get out your desserts easily!