To prepare the Quinoa: Place the quinoa, oil, salt and the water in a medium pot. Bring to a boil, reduce heat to low and let simmer for about 15 minutes or until the water has evaporated and quinoa is tender.
Mix the tomatoes, scallions, red onion, white vinegar, cilantro, lime juice, olive oil, salt and pepper in a bowl. Add the cooked quinoa and mix well.
Place the quinoa salad in a bowl and top with the salmon and avocado slices. Serve immediately.