The landlord won't let me cook for fear of unsanitary or open flames. I suggest that you can discuss with your boss and make a western-style fast food restaurant. The environment is good, don't worry about open fire or unsanitary. Besides, you can find a low-cost product depending on the consumers around you. Domestic western fast food, Sun Star Hamburg and Kabak Hamburg are all famous for their low cost, so you can go and have a look.