the core product is the core product to sell. Excluding packaging and other components In this case, the core product of organic food means the food inside the packaging only.
The core product is the main item will be sold. Excluding packaging and other components of the product core organic food refers to food that is contained inside the package.
The core product is the main product will be sold does not include packaging and the other components in this case core product of organic food is the only food on the packaging.