The two-stage dredge
Crisp crust comes from a dredge that sticks and a fry that does not drop in temperature. The course uses a two-stage approach: a wet dip, then a seasoned dry mix, with a short rest in between. That rest lets the coating hydrate slightly so it does not blow off in the oil.
It is a small step that makes a large difference in how the finished crust looks and holds. The lesson also covers what to do when your oil temperature dips mid-batch, which is the most common reason a first attempt comes out pale and greasy.
Timing, oil temperature, and the rest between stages