Marinade: 1/2 cup rice vinegar
3 tablespoons toasted sesame oil
1 tablespoon minced or grated fresh ginger
1-2 cloves garlic crushed (1 small teaspoon)
1/2 teaspoon wasabi paste
1/4 cup light soy sauce
Combine the marinade ingredients in plastic container or bowl, mix together and add the salmon cubes for at least an hour, turning evenly to coat. Thread salmon carefully onto soaked wooden or bamboo skewers; reserve the marinade.
Cook the salmon under the grill or on an oiled barbecue plate, brushing with the marinade - turning often. Serve with rice and extra soy sauce enhanced with a little wasabi.