Sauté the Aromatics: Place the olive oil in a large saucepan with a tight-fitting lid over medium-high heat.
When hot, add the minced onion and chopped celery or fennel.
Cook, stirring occasionally, until soft, about 2 minutes. 2. Bloom Spices & Toast Couscous: Add the za’atar (or cumin) and a generous sprinkle of salt and pepper.
Stir constantly for about a minute until fragrant.
Add the couscous and continue stirring until it begins to toast and darken slightly, about 2 to 3 minutes. 3. Build the Broth: Stir in the tomato paste until it's evenly distributed and begins to deepen in color, another minute or two.
Pour in the vegetable stock and stir well to dissolve the tomato paste completely. 4.
Simmer and Serve: Bring the soup to a rolling boil, then immediately turn the heat down to low.
Cover the saucepan and let it cook without disturbing for 5 to 10 minutes, or until the couscous is plump and tender.
Taste, adjust the seasoning with more salt and pepper if needed, and serve hot.
Don't skip toasting the couscous and spices. This simple step deepens their flavor and adds a wonderful nutty aroma to the finished soup.