This interactive tree diagram maps a small dataset of Indian dishes into a hierarchical structure organized by region and course type. The visualization uses distinct shapes and colors—circles for the root and courses, squares for regions, and diamonds for dishes—with a legend explaining each category. Built with D3 v7, the code constructs the hierarchy from CSV-style data, applies a tree layout, and renders the result as an SVG using `d3.tree`, `d3.linkHorizontal`, and custom node styling.