Donal goes to the National Botanic Gardens to meet Colm Gibson who runs a scheme on behalf of the Environmental Protection Agency which aims to teach people how to reduce the amount of food waste they generate, and to compost the waste that is an inevitable part of preparing food. All the recipes this week involve using ‘leftovers’ and include Mac ‘n’ Cheese with cauliflower and broccoli, Chicken Caesar Salad, Ribollita (Italian vegetable stew).