I came across this last week and it’s unfortunate that the makers of this toy no longer sells them.
They look so real and tasty – unfortunately it’s not edible. Your dolls/toys shall feast tonight!

From RRCherry’s youtube channel.
1) It is not edible.
(2) This Japanese toy named “Konapun – Hamburger Kitchen” was put on the market in 2007. No longer available.
(3) It is not for children under 8 years old. And must do play under the adult.
(4) The fake food made of Konapun will rot soon.
(5) It doesn’t cook with actual heat. It is just powder and water.
(6) It’s not real oil. 0:41 and 1:46 are the same fake oil made of Konapun powder and water.