1 If the standard is too low, you need to carefully evaluate whether 3 yuan is enough. This is not difficult. The cost of meals will be solved soon. If you find that there is something wrong with your aunt's shopping, you can ask them to keep an account every day and then check it regularly. What's more, you can negotiate the price with the vegetable market yourself, let them go to the place you specify to purchase, and change a few points regularly. If the price of vegetables is really high, you may need to persuade your boss to pay more.
If the taste is too bad, just count the tastes your employees like and take care of most of them. There is no other way.
If it is a health problem: this is your management responsibility. There is no other way to strengthen management.