Half and half

In categories that allow it, such as pizzas, you can make a product half and half: half of one item and half of another.
It takes two steps:
Add the first half as a normal item, with one unit.
For the second half, tap the other item's Options button and then Continue. The quantity screen shows the question Half and half with the previous item: select Yes and tap Add item.
Example: the guest wants a pizza that is half 4 Formaggio and half Carbonara. Tap Medium 4 Formaggio to add it. Then tap Options on the Medium Carbonara, Continue, select Yes and Add item.
On the order screen the two halves appear together, marked 1st half and 2nd half, with a single price.
Keep in mind that:
The question only appears if the previous item is one unit from the same category (or from a category that can be combined with it).
Each half can have its own ingredient changes.
If you delete one half from the order, both are deleted.