Pour boiling water over the bean starch sheets until they are fully submerged. Allow to soak for 30 minutes.
In a sauté pan over high heat, heat the vegetable oil almost to its smoke point. Add the Sichuan pepper and the red pepper flakes to the oil and fry until they begin to turn brown, 5 to 10 seconds. Strain, discard the solids, and reserve the oil.