Burnt bread, collapsed cakes and inedible potatoes: the kitchen failures of Vietnamese families in self-isolation are being shared online, with hundreds of thousands joining a Facebook group to commiserate over their culinary catastrophes.

With half the world in lockdown due to the coronavirus pandemic, masterchefs-in-the-making across the globe have been posting snapshots on social media of their perfect sourdough and gorgeously gooey brownies as they while away the hours in the kitchen.

So many people have been baking bread that yeast has become scarce.

But in Vietnam, Dinh Duc Thanh, founder of the Facebook group, decided the world’s would-be bakers could benefit from a grain of truth.