Heat the vegetable oil on medium-high heat in a very deep 12-quart pot.
Add the onions and sauté for 2 to 3 minutes.
Add the chicken legs and cook on each side until browned, about 2 minutes.
Add the squash, carrots, potatoes, zucchini, tomatoes, turmeric, salt and water.
Stir well, cover the pot and bring to a boil.
Reduce the heat to low and continue cooking for about 1 hour.
Optional: remove the chicken from the pot, pull the meat off the bones and place it back into the soup; discard the skin and bones.
Place the couscous in a microwave-safe dish.
Add the salt, vegetable oil and hot water.
Mix well and cook in the microwave for 5 minutes.
Fluff the couscous with a fork.
Spread the couscous in a really large serving bowl.
Ladle the soup and vegetables on top.
