They probably have nice dishes they use for the cup of garlic sauce when you dine in.
I ordered a side french onion soup with a burger to go once. The soup was a mess obviously not intended to be served in a dish other than the one it’s baked in, but still delicious.
If 250ml of garlic sauce is a menu item, someone likely conceived of this ahead of time.
They probably have nice dishes they use for the cup of garlic sauce when you dine in.
I ordered a side french onion soup with a burger to go once. The soup was a mess obviously not intended to be served in a dish other than the one it’s baked in, but still delicious.