The celebrity chef cooked a beef chilli con carne in the microwave for 40 minutes with no cover on the dish.
Radio 4's breakfast news show traditionally welcomes in famous guests to run the festive programmes.
Hugh Fearnley-Whittingstall says there are 'no easy solutions' to getting families to eat more healthy diets.
Jools Oliver says she gets flashbacks about the near-fatal miscarriage she had before she had her most recent child, four-year-old River Rocket.
More than 15 years after he launched his school dinner campaign, Jamie Oliver is still criticised by turkey twizzler fans.
The cook told her social media followers she wouldn't have got the new job without them "demanding" she had a show.
Many feel the show, which advises how to cook with just kitchen cupboard ingredients, should have gone to 'Cooking on a Bootstrap' chef Jack Monroe
The celebrity chef says his family have proved to be the 'best antidote in the world' during the struggle.
The pair were appearing on Jamie Oliver's cooking show Jamie and Jimmy's Friday Night Feast.