.. _core: Core ==== Vittles provides several models in the **Core** app for working with the basic elements of creating recipes. These include: Foods Edible stuff that you cook with Categories Used for grouping foods Units Ways of measuring food by volume, weight, or discrete quantities, such as cups, liters, ounces or grams Equivalences Conversions between units Preparations Ways of preparing food such as chopping, slicing, or mashing The initial database load populates these tables with some basic starter data, but you may find that you need to add more as you create new recipes.