The second ingredients for specific dish combo is one I find to be strangely popular. I'm told it originated in Hong Kong before travelling to the mainland.
Coca-Cola Chicken Wings.
For 22.90元 / $3.19 including delivery, you get 300 grams of wings and a standard 330 ml can of Coke plus 100 grams of mixed chopped scallions, garlic and ginger.
This is one of the most expensive of these dish ingredient selections. I've never eaten it, so won't judge.
Comes with a recipe leaflet. There are recipes all over the internet in English so I wont bother translating this. Like most Chinese recipes, it is of the 'add the appropriate amount and cook until cooked' type.