Peas, glorious peas. The emeralds of the vegetable world are easily the most useful frozen vegetable. What’s more, because they’re frozen so quickly after picking, they retain their flavour, texture, colour and nutritional value. In my humble opinion, frozen is best. Unless, of course, you’re able to pick them straight from the garden immediately before cooking while they’re still tender and sweet. The fresh peas that grace the supermarket shelves are usually too old to compare favourably to their frozen counterpart.