A Visualization of the Food Ontology available in the Wolfram Language
The nodes of the ontology graph are food-related Wolfram Knowledgebase entity types (e.g. "FoodType", "Food") or Wolfram Language data types (e.g. List, Quantity). The edges of the graph are the properties of the entity types, which connect entity types to other entity types or data types.
The complete code to create the ontology graph itself can be found in the data collection and construction notebooks.
The code for creating and deploying the website, hosted in the Wolfram Cloud, can be seen in the deployment notebook (right-click and hit "Save link as..." to download).