1. Rinse the quinoa under cold water.
2. In a saucepan, bring water to a boil. Add quinoa, reduce heat, cover, and simmer for 15 minutes.
3. Fluff quinoa with a fork and let it cool.
4. In a mixing bowl, combine quinoa, pineapple, broccoli, and mint.
5. In a small bowl, whisk together olive oil, lemon juice, salt, and pepper.
6. Pour the dressing over the salad and toss to combine.
7. Serve chilled or at room temperature.