any recipe with mustard sauce?

Mustard sauce is a rather weak and runny solution of mustard. You can use it in any sauce recipe that calls for mustard. Mustard 'heat' is rather different from chili or ginger. If you combined your mustard sauce with about twice as much salad oil (and, perhaps, some pepper and herbs to taste) it would make a good dressing for a salad, either a green salad or a bean salad. Alternatively, it works very well with fish, especially oily fish like mackerel, sardines or salmon (it depends what fish are common in your country). I would also add some fennel or dill and, perhaps a little lime or lemon juice or vinegar.

I would use it in meatloaf (or veggie loaf) or mix it in with ground Boca (or ground chicken or turkey). It would also be good with shrimp and veggies. The sauce won't "expire" in October, though. That is simply a sell by date, which has no real basis. I shudder to think of how much food has been tossed simply because people think that food spoils on an arbitrarily chosen date.