What is the function of plain flour in gingerbread biscuits?

Plain flour serves as the primary structural component in gingerbread biscuits, providing the necessary bulk and texture to the dough. It helps to bind the ingredients together, allowing the biscuits to hold their shape during baking. The type of flour also influences the final texture, contributing to a chewy or crisp result depending on the ratio of ingredients used. Overall, plain flour is essential for achieving the desired consistency and structural integrity of the biscuits.