Think it's a delivery-only deal, but helps with cost - I never order drinks if I have something here. I do love McD's milkshakes but don't think I've had one in years, becomes a bit much for me on-top of their food
I just munched down all three burgers, beyond saving a bit of QP for the woofer
I actually normally order burgers without cheese, just couldn't edit the deal - and wanted to try the new chilli double cheese as it came.
Gherkins 100% fine, though they're like marmite to dogs. Some of mine have loved, others hate

Same goes for cucumbers in general.