Put the quinoa and water in a saucepan then bring it to the boil. Reduce the heat and simmer for about 15 minutes until the quinoa is tender and the water has absorbed.
In the meantime, shred the beetroot into thin strips or cut it into tiny cubes.
Blanch or steam the kale and beans for a couple of minutes, then drain.
Whisk the lemon juice and oil together. Add the honey and mustard (if used). Season with salt & pepper.
Loosen the grains of the quinoa and add the vegetables, then toss with the dressing. Stir through the herbs and serve at room temperature.