Preparation:
Make the tempura batter by mixing the tempura flour with 150 cold water or cold sparkling water. Bread the chicken pieces in the tempura batter. Heat oil in a saucepan or pan and fry the chicken pieces in hot oil until golden on all sides within 4-5 minutes. Remove from pan or saucepan and drain excess fat on paper towels.
For the sauce, mix together sriracha or sweet chili sauce, lime juice, sugar, and soy sauce. Pour the sauce over the chicken pieces, mix and place on a serving platter or plate. Sprinkle with sesame seeds and chopped green onions. Serve immediately.