A reader named Nick posed a reasonable question to The Guardian's food columnists: why do recipes measure fresh ginger in vague terms like 'thumbs' and centimetres when the root vegetable varies so dramatically in shape and density? The responses he received essentially amounted to a collective shrug—and that's precisely the problem. While Felicity Cloake, Georgina Hayden, and Ravinder Bhogal all make valid points about the philosophy of cooking, they've inadvertently exposed a lazy convention that deserves to be retired.
Cloake admits outright: 'That's a very good question, and I don't think there is a very good answer.' At least she's honest. She suggests the thumb measurement persists out of mere convention, and that giving precise weights for staples might feel 'fussy.' Bhogal attempts to standardize the chaos by defining a thumb as roughly 5cm long and weighing about 15g, but this only reinforces how arbitrary the entire system is. If expert food writers need to create their own definitions to make sense of the measurement, surely that signals the system has failed.
The argument that imprecise measurements encourage home cooks to relax and trust their instincts has merit—up to a point. Hayden notes that unlike risotto rice ratios or cake recipes, curry doesn't demand scientific precision. Fair enough. But there's a significant difference between intentional flexibility and unintentional confusion. A cook following a recipe shouldn't have to wonder whether their thumb is the right size, or whether they've estimated correctly. These unnecessary mental hurdles do nothing to empower cooks; they simply create opportunities for disappointment.
Cloake herself concedes the obvious truth buried in her own reasoning: 'But he's right, we should probably move to grams.' Not 'maybe.' Not 'someday.' Probably. That's an acknowledgment that the status quo is indefensible. If a piece of ginger is 'very thick' or 'wasn't thumb-shaped,' Cloake says she adjusts it so the cumulative flesh matches a thumb's worth. Why not just say 15 grams from the start and spare everyone the guesswork?
Cooking should indeed be instinctive and empowering, but that doesn't require keeping measurements deliberately vague. A recipe that specifies '15g of ginger' doesn't prevent a cook from adding extra if they prefer stronger flavours. It simply removes an unnecessary barrier to success. The food columnists quoted here have built careers on precision and clear communication. It's time they applied those standards to ginger—and every other ingredient that currently hides behind the fog of thumb-shaped approximations.