Warm the dashi stock in a saucepan and adjust seasoning with salt, if required. Bring to a boil over medium heat and add the shrimp. Reduce the heat and simmer for 1 to 2 minutes, until the shrimp turns pink. Add the okra and soy sauce and remove from the heat.
Place 2 shrimp in each serving bowl and ladle the soup over them. Garnish with the lemon zest