Easy & Simple Tenmusu (Shrimp Tempura Rice Ball)

Name: Easy & Simple Tenmusu (Shrimp Tempura Rice Ball)
Prep time: 8 min
Cook time: 2 min
Total time: 10 min
Cuisine: Japanese
Ingredients: 2 2/3 cups cooked short grain rice (or 320 ml uncooked rice cooked according to packet instructions); 2 sheets nori; ¼ tsp salt; 8 pieces jumbo shrimp (peeled and deveined); 1 cup vegetable oil (or as needed); 2 tbsp + 2 tsp potato starch (or cornstarch); 2 tbsp + 2 tsp cake flour ((not all purpose flour)); 1/8 tsp salt; 1/4 cup water (cold); ¼ cup Tsuyu Soup Concentrate (store bought)