If you are hunting for a work lunch that costs less than a bottle of water from the station kiosk, this cheap egg fried rice meal prep is the one to learn first. It uses day-old rice, a handful of eggs, and whatever frozen veg is lurking in the freezer, and it turns into four proper lunchbox portions for well under £1 each. No fancy kit needed — just a big frying pan or wok, a spatula, and about half an hour on a Sunday evening. Fried rice gets better, not worse, when it is made ahead. The grains firm up in the fridge, which means they fry up with…