Place all the dressing ingredients in a small bowl or a jar and shake/stir like crazy. Set aside (for best flavor, let chill in the fridge for 30 minutes-1 hour).
Cook the quinoa according to package instructions. Set aside to cool.
Assemble the salad. In a large bowl, mix the spinach leaves, half of the dressing, carrot strips in a bowl.
Gently mix to combine.
Arrange other ingredients on a large serving platter and add beetroots (I like to add a pinch of salt to the beetroot before serving), feta cheese, and top with more dressing and seeds and nuts if using.
You can add a squeeze of citrus juice or a little lemon zest for a pleasing aroma and delicious flavors.