1. Squeeze the couscous in a salad bowl. Drizzle with grapefruit juice and 3 tablespoons of olive oil. Stir and let it swell.
2. Peel the remaining grapefruits to obtain skinless segments.
3. Wash, dry the tomatoes and cucumber. Remove the seeds, and cut them into small cubes.
4. Cut the fish into small pieces, then steam them.
5. Separate the surimi into strips.
6. Peel and slice the onions into rounds.
7. Finely chop the herbs.
8. Add all these ingredients to the couscous and mix well. Season with a few drops of Tabasco, salt, and pepper.
9. Serve this tabouleh cold.
10. Garnish with a few unpeeled shrimp and mint leaves.