Prepare the Base: Begin by peeling your Saba bananas. Slice each one in half lengthwise. If the bananas are exceptionally large, you can slice them into thirds, but halves usually provide the best fruit-to-wrapper ratio.
The Coating Station: In a shallow plate or bowl, combine your brown sugar and vanilla extract. Use a fork to work the vanilla into the sugar until it’s fragrant. Roll each banana slice in the mixture, pressing down slightly so the sugar sticks to the moisture of the fruit.
Positioning the Wrap: Lay a lumpia wrapper flat on a clean surface in a diamond shape. Place one sugar-coated banana slice on the lower third of the wrapper, closest to you.
The Folding Technique: Fold the bottom corner over the banana and pull back slightly to create a tight "log." Fold the left and right sides toward the center, then continue rolling upward tightly.
Sealing the Deal: Before you reach the top corner, dip your finger or a pastry brush into the cornstarch slurry and lightly coat the edges. Finish rolling to seal the Turon shut.
Frying to Perfection: Heat your oil in a wide pan over medium heat. You’ll know it’s ready when a small piece of wrapper sizzles immediately. Carefully slide the Turon into the oil. Do not overcrowd the pan.
The Golden Finish: Fry for about 2–3 minutes per side. Watch for the sugar to begin caramelizing through the wrapper, creating dark golden spots. Once they are a deep amber and crispy, remove them.
Drain and Cool: Place the finished Turon on a wire cooling rack rather than paper towels. This allows air to circulate, preventing the bottom from becoming soggy while the sugar hardens.