I think that these robots can help some people, who can't cook or are disabled, earn money by buying a robot, and selling the food which the robot cooked . The owner need to do is buy a robot, hot dogs, electricity, rent a small building, etc to sell hot dogs for people who want to buy a cooked hot dog, but don't want to cook it themselves, or buy a robot to cook it for them.
But, some poorer people may need to sell their possessions like their car or home, or take out a loan from the bank, their parents, family, and friends to afford renting a restaurant, chairs, robot, meat, and other expenses needed to start a restaurant with a robot chef.
There would still be other human jobs like restaurant owner, parking attendant, waiter, robot repair, robot cleaning, health inspector, meat factory worker, and farmer which are needed for running a restaurant and producing meat which will still be done by humans in the future because it is sometimes easier and cheaper just to hire a person to do the work, or do it yourself, or ask a family member like your son or daughter where they work for free or below minimum wage.
I also don't see food trucks, roadside hot dog and food stands being replaced by robots because a lot of food trucks, roadside hot dog stands are owned and run by the owner, so it is cheaper just to stand by the side of the road, and use a stove to manually cook hot dogs and burgers when someone orders food.