I have only had an opportunity to cook a roast in this Medium Square 2.5L ovenware Flatstack. The roast sat on the bottom had quartered potato and carrot sitting on top and I added some male syrup to this combo before cooking. The roast was good, and I'm not a very meaty person, so were the vegies. I washed the container and when dry put the remaining roast into the container. It has kept well and I must say I don't like Flatstacks.... I love them. Looking forward to using this new Flatstack on the BBQ whilst travelling.