Rinse the quinoa. Combine rinsed quinoa with the curry powder, salt, and 4 cups cold water in a large pot. Cover, bring to a boil, then reduce heat to low and simmer, covered, for 18 minutes. Turn the heat off and let sit, covered, an additional 5 minutes.
In a large bowl make the dressing by combining the olive oil, vinegar, salt, lemon juice and zest, and garlic, whisking until well combined.
To the dressing add the diced cucumber, apple, and peppers. Add the warm quinoa and stir until well combined. The mixture will be on the wet side. Let sit at least an hour for the dressing to absorb and flavors to develop.
Stir in the basil, then cover and chill for, or serve with a sprinkling of sunflower or pumpkin seeds.