Hawaiian Style Fish Chowder with Okinawan Sweet Potatoes

Name: Hawaiian Style Fish Chowder with Okinawan Sweet Potatoes
Ingredients: 1 tablespoon canola oil; 1 cup thinly sliced Maui (or sweet) onion; 1/2 teaspoon grated fresh ginger; 1/2 teaspoon chili garlic sauce; 2 1/2 cups Okinawan (purple) sweet potatoes; 1 tablespoon fish sauce; 2 cups water; 1 teaspoon sea salt; 2 teaspoons sesame oil (divided); 1 1/4 cups coconut milk; 1 pound ono (wahoo) cubed in 1/2 inch pieces; 1 cup grated green (raw) papaya; 1 tablespoon soy sauce; 1/4 cup sliced green onion; 1/2 teaspoon sesame seeds