In a large saucepan, combine the sake with 1 cup of water and 2 shiso leaves and bring to a boil. Reduce the heat and simmer. Add the shrimp and poach until light pink and the tails are curled, about 3 to 5 minutes.
For each serving, spread 2 tablespoons of Sushi Rice in a rectangle. Lay 2 shiso leaves on top and arrange 5 shrimp, tail end up, on the shiso leaves. Serve with 1 tablespoon soy sauce and 1 teaspoon wasabi paste.