They’re overpriced, structurally unsound and weirder by the year, yet we buy them anyway. Hannah Twiggs investigates the runaway Christmas-sandwich economy, the cold-roast physics behind them and why your pick reveals more about you than it should

Batch cooking is back on the menu – but forget the boring stuff. Hannah Twiggs rounds up big-flavour, budget-friendly recipes designed to stretch across the week without stretching your wallet