Scotch egg The humble Scotch egg lays out features of successful products: Simple components, well planned & properly executed (hard or soft boiled egg, enclosed in sausagemeat, rolled in breadcrumbs & fried).  Many claims to invention (Scotland, England, India, Algeria).  Enduring (from pre-18thC).  Convenient (portable snack).  Good anywhere (indoor meal, outdoor picnic).  Popular (versions worldwide). …