Pro Tips: The #1 rule for perfect pinwheels: SQUEEZE YOUR SPINACH DRY. Thawed spinach holds a shocking amount of water—use a clean kitchen towel and wring it out completely. Chill the rolled tortillas for at least 1 hour (overnight is even better) before slicing; this firms up the filling for clean, beautiful cuts. For the neatest slices, use a serrated knife and wipe it clean between cuts. The Knorr Vegetable Recipe Mix is the magic ingredient—don't substitute it!