In a medium saucepan, bring water to a boil. Add rinsed quinoa, reduce heat to low, cover, and simmer for about 15 minutes or until water is absorbed. Fluff with a fork and set aside to cool.
While the quinoa is cooking, prepare your veggies. Chop the cherry tomatoes, cucumber, bell peppers, and shred the carrots and cabbage.
In a large bowl, combine the cooled quinoa with cherry tomatoes, cucumber, bell peppers, carrots, and cabbage. Toss gently to mix.
In a small bowl, whisk together olive oil, lemon juice, salt, and pepper to make the dressing.
Drizzle the dressing over the salad mixture and toss again to combine everything evenly.
To serve, scoop the rainbow salad into bowls, top with avocado slices, fresh cilantro, feta cheese (if using), and sprinkle with sunflower seeds for an extra crunch.
Notes
Serve in transparent glass bowls to showcase the vibrant colors of the salad. Garnish with a sprig of cilantro on top for an added pop.