Firstly rinse the quinoa in a fine sieve really well for at least 1 minute (this removes the bitter saponins from the quinoa). Cook the quinoa by placing it into a pot with 1½ cups of water.
Bring the mixture to a boil over medium-high heat, then decrease the heat a bit to maintain a gentle simmer. Cook uncovered until the quinoa has absorbed all of the water, about 10 to 12 minutes.
Remove the pot from heat, cover, and let the quinoa steam for 5 minutes. This step gives the quinoa time to pop open and the little white spiral to appear. After 5 minutes, remove the lid and fluff the quinoa with a fork. Allow to cool.
Place all of the dressing ingredients into a jar and shake well to combine.
In a large bowl mix together the quinoa and tuna.
Mix through the dressing, adding gradually until the quinoa and tuna are well coated but not drowning in dressing.
Now fold through the tomatoes, carrot, leafy greens and herbs. Enjoy!