Whisk together all dressing ingredients in a small bowl.
Put cooked quinoa in a large bowl. Add dressing, flax seed and lemon zest and stir to combine.
Add greens, cucumber, edamame and scallions to the quinoa and toss to combine. Adjust salt to taste.
Spoon the quinoa mixture onto a plate and scatter toasted pepitas over the top.
Notes
For a lower potassium modification,, use kale instead of spinach, substitute sugar snap peas for edamame and omit avocado. Dish will still be medium potassium, not low potassium.