Home Garden is a quest in the Colonial Era of Tropico 5 given by Lord Oaksworth who asks you to help the colonists have access to a proper English breakfast made up of four dishes. To achieve this he asks you to have at least four different food sources on Tropico.
Quest Dialogue
I say, you need at least four dishes for a proper English breakfast, my good chum.
Providing His Majesty's subjects with as many different food products will increase the Food Variety on your colony and thus increase the Food Happiness of Tropico.
Objectives: Build 4 different Food producing buildings
Reward: Your mandate will be extended by 6 months