Rinse quinoa thoroughly in a fine-mesh sieve under cold running water.
Combine quinoa and water in a medium saucepan and bring to a boil over high heat.
Reduce heat to low, cover, and simmer for 15 minutes or until liquid is fully absorbed.
Remove from heat and let stand covered for 5 minutes, then fluff with a fork and cool to room temperature.
In a large bowl, whisk together the olive oil, lemon juice, salt, and black pepper.
Add the cooled quinoa, raisins, parsley, red onion, and cucumber to the bowl.
Toss the ingredients until evenly distributed and coated with the dressing.
Refrigerate for at least 10 minutes before serving for optimal flavor development.