Sometimes an ingredient can be slightly difficult to pick out of a list, if the list is a long one or there are many similar ingredient names.
To tag an ingredient as a favorite, go to the Ingredient Center.
Select the required Ingredient and view it, then simply click the Star next to its name and click Save.
Then go in to the Ingredient Center, this ingredient will appear in the Favorites group. When searching for an ingredient to put into a recipe, the Favorites will appear at the top of any search. To remove this ingredient from your Favorite list simply remove the tick again, click the Star again and click Save.