What food substance does bread roll contain?

Flour: This is the main ingredient, providing the structure and texture to the roll. It's typically made from wheat, but can also be made from other grains like rye or barley.

Water: This is essential for hydration, allowing the gluten in the flour to develop and creating a soft texture.

Yeast: This is a single-celled organism that ferments the sugars in the flour, producing carbon dioxide gas which causes the dough to rise.

Salt: This enhances the flavor and controls the yeast activity.

Other potential ingredients:

* Sugar: This can be added to enhance flavor and help with the yeast fermentation.

* Fat: Butter, margarine, or oil are often used to add richness and moisture.

* Milk or eggs: These can also add flavor and richness.

* Flavorings: Herbs, spices, and other additions can be included to create different flavors.

The specific ingredients and their proportions will vary depending on the recipe and type of bread roll.