Final answer:
To produce a successful puff pastry dough, the roll in fat should have the same consistency as the dough.
Step-by-step explanation:
In order to produce a successful puff pastry dough, the roll in fat should have the same consistency as the dough. This means that both the dough and the fat should be firm and chilled before rolling. If the fat is too soft or melted, it can blend with the dough and result in a less flaky texture. On the other hand, if the fat is too hard, it can be difficult to incorporate into the dough and may not distribute evenly, resulting in uneven layers.