Fill your sink with water and let the herbs soak it in to remove any dirt.
Drain on a tea towel until dry or salad spinner, then chop finely- discard the mint stems but chop the parsley stems.
Add all the herbs to a large bowl with the spring onion, garlic, cucumber, quinoa, and lentils.
Combine the oil, lemon juice, and salt, and dress the salad.
Mix everything together well. You might like it a bit saltier, or with more lemon or garlic. Adjust to taste.