Needs must and all that, so I have always been an open anti-perfectionist, but in truth (and I’m sorry to repeat what I’ve said before) it is impossible to cook roast potatoes without needing them to be perfect, which to me means sweet and soft inside and a golden-brown carapace of crunch without. And, strangely, no matter how many tricksy things you may succeed at in cooking, no matter what techniques you may master, nothing gives quite the contented glow of achievement that cooking a good...