To achieve fully transparent, chewy tapioca pearls for bubble tea, follow a two-stage cooking method with precise timing and resting.

Start by using a large pot with at least an 8-to-1 water-to-pearl ratio, ensuring the pearls have ample space to move without clumping or becoming gummy from excess starch. Bring the water to a rolling boil before adding the pearls—do not rinse them beforehand, as starch will dissolve in cold water. Once added, stir gently and continuously at first to prevent sticking to the pot bottom. After the pearls rise to the surface and the water returns to a boil, reduce heat to medium or medium-low and maintain a gentle simmer.

Boil for 20 to 35 minutes depending on pearl size and brand; smaller pearls require less time. The critical step for achieving a translucent center is the resting phase. After boiling, turn off the heat, cover the pot with a lid, and let the pearls sit undisturbed in the hot water for another 20 to 40 minutes. This residual heat allows the hard white core to cook through completely without the outer surface becoming mushy. If pearls still show a hard center after boiling, they need extended resting time rather than additional boiling.

Once resting is complete, drain the pearls and rinse briefly with warm or cool water to remove surface starch and halt the cooking process. Avoid prolonged rinsing, which can harden them. Finally, soak the pearls in sugar syrup, brown sugar syrup, or black sugar sauce for at least 15 minutes to sweeten them and maintain their glossy appearance. For optimal texture and translucency, consume within four hours of cooking, as refrigeration will eventually cause them to harden and lose clarity.