Though I am a big fan of sisters Margaret and Irene Li — who I consider the Dumpling Queens of Boston — I hesitated to buy this book because it does not address plant-based eating. But what it does address is food waste,  a leading cause of greenhouse gas emissions and climate change. It is not hyperbole when I say this book changed how I cook; i.e., using parts of vegetables I never considered using, what I do and don’t throw away, what and how I compost.