Fibre is the unsung hero of budget eating. It keeps you full for hours, feeds your gut, and — crucially for the wallet — it comes almost exclusively from the cheapest foods in the supermarket: beans, lentils, oats, veg and whole grains. These asda budget meal prep ideas prove the point: five proper high-fibre dinners, each under £1 a portion, built from Asda’s Smart Price and own-brand range. Each recipe makes 4 portions and delivers at least 10g of fibre per serving — roughly a third of the 30g daily target UK guidelines suggest. They are all one-pot or one-tray affairs, they all reheat well, and none of them tastes…