I want it known far and wide that this is a thrilling, sagacious, impassioned, persuasive and profound book, whose value rises in proportion to the clarity of its prose, depth of erudition and scale of ambition. Delia casts herself as nothing more than a mid-80s ex-chef who has learned a thing or two. This under-sells it. In fact, she emerges as a mesmerising, compassionate and noble humanitarian who has thought hard about the biggest challenge of our age -- AMOL RAJAN