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In a small saucepan, heat vegetable stock to a vigorous simmer.
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At the same time, set a wide 2-quart saucepan over medium/medium-high heat. Add olive oil. When oil starts to shimmer, add couscous. Cook stirring almost constantly until the couscous is golden and smells nutty, 3 - 5 minutes. Edge heat down or pull pan from heat if it starts to burn. Stir hot stock into couscous, add 1/2 teaspoon sea salt, stir, cover, and turn heat to low. Cook 10 minutes, or until couscous is cooked through and all the water is absorbed, fluff with a spoon, and cool for 10 minutes.
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To make dressing, use a fork to combine lemon juice, sherry vinegar, and sea salt. Whisk in olive oil.
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To plate the salad, toss couscous, herbs, greens, and green onions with half the dressing. Taste and add sea salt as needed. Arrange in a bowl, scatter feta on top, and cover a section with tomatoes. Finish the tomatoes with a generous pinch of sea salt and a twist or two of pepper, and serve.
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Toss leftovers together in a big container. Salad will keep well sealed in the fridge for 5 days.