Rinse the rice, peas and lentils and add to a saucepan with 4 cups of water. Bring to the boil then reduce heat and gently simmer for 20 minutes until just tender. Immediately place cooked mix in a thin layer on a tray to cool.
To make the dressing, whisk together the oil, garlic, lime juice, cumin and sugar in a small bowl. Season dressing to taste with salt and pepper.
In a large bowl, combine the coriander, onion, tomato and cucumber with the cooled rice mixture.. Pour over the dressing and toss to coat well. Season with more salt and pepper if required.
Garnish with coriander, crumbled feta and lime wedges.