Warm Quinoa and Roasted Vegetable Salad

Ingredients

• 1 cup quinoa (well washed and drained)
• 1 3/4 cups water
• 1/4 teaspoon sea salt (plus more to taste)
• 4 tablespoons extra-virgin olive oil (divided)
• 1 medium yellow onion (cut into half-moons)
• 2 stalks celery (chopped)
• 1 carrot (sliced into ¼-inch-thick rounds)
• 1/2 large golden beet (halved lengthwise and cut into ¼-inch-thick slices)
• 2 1/2 cups broccoli florets
• 2 tablespoons balsamic vinegar
• 1 large clove garlic (minced or pressed)
• Juice of 1/2 lemon
• 1/2 cup chopped fresh parsley
• 2 ounces feta cheese (crumbled (optional))