Roast tomatoes and prepare oil: Put oven rack in middle position and preheat oven to 250°F.
Toss tomatoes with sugar, 1/2 teaspoon salt, and 1/4 teaspoon pepper and arrange, cut sides down, in a small shallow baking pan. Heat oil in a 9- to 10-inch heavy skillet over moderate heat until hot but not smoking, then cook garlic, stirring occasionally, until pale golden, 1 to 2 minutes. Stir in basil and whole oregano leaves, then pour oil over tomatoes. Roast tomatoes until very tender but not falling apart, 2 1/4 to 2 1/2 hours.
Transfer tomatoes with a spatula to a large plate, then pour oil through a fine-mesh sieve into a small bowl or measuring cup, discarding solids. Stir in chopped oregano, zest, juice, and remaining 1/4 teaspoon salt and pepper.
Cook couscous: Heat 2 teaspoons olive oil in a 3-quart heavy saucepan over moderate heat until hot but not smoking, then toast couscous, stirring occasionally, until fragrant and pale golden, 3 to 5 minutes. Add broth, water, and salt and simmer, covered, until liquid is absorbed and couscous is al dente, 10 to 12 minutes. Remove from heat and let stand, covered, 10 minutes, then stir in 2 1/2 tablespoons lemon oregano oil. Season with salt.
Roast salmon while couscous stands: Put oven rack in upper third of oven and preheat oven to 500°F. Line a 17- by 12-inch shallow baking pan with foil.
Arrange salmon, skin sides down, in baking pan, then drizzle with olive oil, rubbing it over tops of fillets, and sprinkle with salt. Roast salmon until just cooked through, 12 to 14 minutes.
Divide couscous among 6 plates. Lift salmon flesh from skin with a slotted spatula and transfer a fillet to each bed of couscous. Put 2 tomato halves on each plate, then sprinkle salmon with olives and drizzle with some lemon oregano oil.
Cooks' note: Tomatoes can be roasted 3 days ahead and chilled in oil in an airtight container. Bring to room temperature before proceeding.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	518.72 Kcal (2172 kJ)
Calories from fat	279.13 Kcal
		% Daily Value*
Total Fat	31.01g	48%
Cholesterol	23.53mg	8%
Sodium	855.74mg	36%
Potassium	364.48mg	8%
Total Carbs	49.29g	16%
Sugars	4.13g	17%
Dietary Fiber	3.74g	15%
Protein	15.53g	31%
Vitamin C	13.1mg	22%
Iron	2mg	11%
Calcium	62.9mg	6%

Amount Per 100 g
Calories	166.58 Kcal (697 kJ)
Calories from fat	89.64 Kcal
		% Daily Value*
Total Fat	9.96g	48%
Cholesterol	7.56mg	8%
Sodium	274.81mg	36%
Potassium	117.05mg	8%
Total Carbs	15.83g	16%
Sugars	1.33g	17%
Dietary Fiber	1.2g	15%
Protein	4.99g	31%
Vitamin C	4.2mg	22%
Iron	0.7mg	11%
Calcium	20.2mg	6%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

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