To follow on Rushabh’s guidance, in the Recipe Ingredient child doctype, you can create a Link field to your base (non-child) Ingredient doctype. That allows you to have properties that apply to either the master doc or the child. For example, your master doc (Ingredient) might define things inherent to the food like calories per gram, while your child doc (Recipe Ingredient) might define things particular to a recipe like quantity and unit of measure.