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1
Make the yogurt-sumac sauce by mixing together yogurt, sumac powder, 1 clove minced garlic, and 1 tablespoon minced onion. Allow to sit at room temperature for about an hour. (Can be made ahead of time and refrigerated.).
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2
Cook the lentils in simmering water until tender, following package directions. Drain and set aside.
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3
Put couscous in a bowl with 3 cups of boiling water. Stir and let sit away from heat until all water is absorbed and couscous is tender. Set aside.
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4
Heat olive oil over medium heat. Add chopped onion and saute until onion is transparent. Add garlic and bell pepper, and saute for 2-3 minutes, until vegetables are softened. Add carrots and green beans. Cover and simmer for about 10 minutes, until green beans are tender. Stir occasionally.
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5
When green beans are cooked, stir in the spinach and simmer 1-2 minutes, until spinach is wilted. Stir in the za'tar, salt and pepper to taste, and remove from heat.
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6
Mix the vegetable mixture with the lentils, couscous, and feta. Stir gently until well combined. Serve topped with diced tomatoes and cucumber, and with yogurt-sumac sauce to taste.