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Cook the quinoa in a large pan of boiling water for 10-15 mins until tender, drain well, then set aside to cool.
Meanwhile, heat the oil in a small pan, then cook the shallot or onion for a few mins until softened. Add the tarragon, stir well, then remove from the heat.
Stir the softened shallot and tarragon into the cooled quinoa along with the lentils, cucumber, feta, spring onions, orange zest and juice and vinegar. Toss well together and chill until ready to serve.