In this task, you have to generate the named entities (NER) given its ingredients of the recipe. Named entities are the names of the items without their quantity.
One example: 1 3/4 cups all purpose flour, 1/4 cup finely ground blanched almonds, 1 teaspoon grated lemon zest, 1/2 cup confectioners sugar, 2 sticks unsalted butter, almost melted, 4 eggs, lightly beaten, 2 cups granulated sugar, 1/4 cup flour, 1/2 teaspoon baking powder, 2 teaspoons grated lemon zest, 1/3 cup fresh lemon juice, Candied violets for garnish, optional
Solution is here: flour, ground blanched almonds, lemon zest, confectioners sugar, butter, eggs, sugar, flour, baking powder, lemon zest, lemon juice, Candied violets
Explanation: Given the required ingredients, the ner of the recipe is generated. As the ingredients contain the quantities, if we just remove quantities from ingredients, we get the ner.

Now, solve this: 1/2 c. chopped onion, 1/2 c. chopped green pepper, 1/2 c. chopped celery, 1 clove garlic, 1 Tbsp. cooking oil, 1 (28 oz.) can chopped or crushed tomatoes, 1/4 lb. bacon, 1/2 lb. lean hamburg, 3/4 c. long grain rice, 1 tsp. chili powder, 1 tsp. sugar, 1/2 c. shredded Cheddar cheese (optional)
Solution:
onion, green pepper, celery, clove garlic, cooking oil, tomatoes, bacon, lean hamburg, long grain rice, chili powder, sugar, Cheddar cheese