Rinse the rice, peas and lentils. Add to a saucepan with 4 cups of water. Bring to the boil, reduce heat and gently simmer for 20-25 minutes until just tender. Drain and rinse well under cold water. Spread out on a tray and refrigerate until required.
Combine cooked rice mix, onion, cucumber, corn, capsicum, tomatoes and coriander in a large mixing bowl. Toss well. Mix in the combined oil, vinegar, cumin and sugar. Season well and toss to coat.
Serve in bowls with sliced avocado, corn chips, dairy free sour cream and lime wedges.