In a medium pot, add 1 cup quinoa, 1 1/2 cups cold water and a pinch of salt. Cover, bring to a boil, reduce heat to low and cook for 12 minutes. Let it stand for 5-10 minutes covered.
In the meantime, in a large salad bowl, add tomato, cucumber, bell pepper, avocado, onion, cilantro, feta cheese, olives, lime juice, oil, cumin, salt and pepper.
Fluff quinoa with a fork and add to the bowl. Stir gently to combine and serve cold or warm.
Notes
Store: Refrigerate covered for up to 3 days.
Make ahead: Add all ingredients, except oil, lemon juice, salt, pepper and cumin, to a large salad bowl and do not mix. Cover and refrigerate for up to 24 hours. When ready to serve, add seasonings.
Quinoa: White or tri-colour quinoa. Red quinoa is too hearty and chewy for a salad.
Leftover cooked quinoa: Quinoa lasts in the fridge for up to 5 days. I often use dinner leftovers to make salads.
Feta cheese: I recommend to buy a block of feta and crumble yourself to avoid anti-caking agents. Crumbled goat cheese would work too.