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Rinse the quinoa and combine it with the stock in a pot. Bring to a boil, lower the heat to low, cover, and simmer until the quinoa is tender, about 15 minutes. Turn off the heat and let sit for 5 minutes.
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Meanwhile, to make the dressing, combine the lemon juice, mustard, and nutritional yeast in a bowl. Slowly drizzle in the oil while whisking to emulsify the dressing and make it creamy. Add salt and pepper to taste.
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Wash and stem the kale. You can do this by holding the stem with one hand and running the other hand down the stem from base to tip, ripping off the leaf in the process. Tear into bite-size pieces and place in a large bowl.
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Once the quinoa has cooled enough to handle, add it to the kale.
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Pour half of the dressing over the kale salad and mix to coat, using clean hands or two wooden spoons. Add more dressing as needed.
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Peel and pit the avocado and cut into bite-size pieces. Halve the tomatoes. Reserve some of the tomatoes for garnish, and carefully fold the rest along with the avocado in with the kale and quinoa.
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Pile the salad onto a large serving platter and top with the reserved tomatoes.
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Pack any leftover quinoa salad in a container and keep it in the fridge. The next day, grab the quinoa salad, a fork, and a napkin, and you are good to go!