Add enough orange juice to the mandarin orange juice to make 2 1/4 cups liquid. Bring the juices and cumin to a boil in a saucepan. Remove from heat and add couscous. Cover and let stand 5 minutes. Pour into a large bowl and let cool.
Combine oil, soy sauce and lime juice. Stir into couscouls mixture. Add in mandarin oranges, cilantro, basil, green onions, ginger and pineapple. Sprinkle with pine nuts.