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Preheat the oven to 200 degrees Celsius (400 degrees Fahrenheit).
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In a large baking tray lined with baking paper, toss the cauliflower, mushrooms and onion in the olive oil, thyme, garlic and salt and pepper. Bake for 20-30 minutes until they start to caramelize, ensuring that you stir half way through. Once this is done remove from the oven.
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Meanwhile, bring the water and quinoa to the boil. Once it is boiling reduce the heat and simmer, covered, until the quinoa has absorbed all the water. This should take about 15-20 minutes. Once it is cooked, remove from the heat and allow to sit for 5 minutes covered.
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In a large serving bowl combine the quinoa, roasted vegetables and salad leaves. Pour the balsamic vinegar over the ingredients, and stir to combine.