Cook the rice according to package directions using water. Fluff with a fork, Season with salt and black pepper, then keep warm.
Heat the olive oil in a large pot over medium-low heat. Add the onion and sauté until softened.
Add the chicken and cook briefly, then stir in the ginger, garlic, and curry powder. Cook until fragrant.
Mix the cornstarch with the coconut milk and stir to combine and add it to the pot.
Bring to a gentle boil, then reduce heat and simmer until the chicken reaches an internal temperature of 165°F (74°C). Stir in the fish sauce if using, brown sugar, and lime juice, then simmer briefly until the curry thickens.
Soften the rice paper sheets in warm water one at a time. Lay flat and fill with butter lettuce, carrots, cucumber, jalapeño, scallions, mint, and cilantro. Roll tightly and set aside.
In a bowl, mix the peanut butter, rice wine vinegar, soy sauce, honey, sesame oil, and garlic. Add water gradually until smooth and pourable.
In a blender, combine the banana, maple syrup, vanilla extract, milk, and water. Blend until smooth.
Serve the Thai yellow curry with rice, spring rolls with peanut sauce, and Korean banana milk.