Chè Chuối (Vietnamese Banana, Tapioca, and Coconut Milk Dessert)

Name: Chè Chuối (Vietnamese Banana, Tapioca, and Coconut Milk Dessert)
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Yield: 6
Ingredients: 2 1/2 cups (600ml) water; One 13 1/2–fluid ounce (400ml) can coconut milk, divided; 3 pandan leaves (about 20g), tied into a knot, or 1/2 teaspoon vanilla extract (see notes); 1/3 cup (55g) small tapioca pearls; 1 pound (450g) pisang awak bananas, peeled and cut on a diagonal into 1-inch-thick slices (see notes); 3 tablespoons (45g) sugar, plus more if needed; 1/4 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume; 1/3 cup (50g) unsalted roasted peanuts, roughly crushed, for garnish