Preparation Toss green onions, dill, cilantro, and mint in small bowl. Set herb mixture aside. Toast coriander seeds in small dry skillet over medium heat until slightly darker in color and fragrant, about 2 minutes. Cool. Crush in mortar with pestle, or place in plastic bag and coarsely crush with mallet or rolling pin. Whisk 1 tablespoon oil, 1 tablespoon lemon juice, 1 garlic clove, 1/2 teaspoon lemon peel, and half of crushed coriander in 11x7x2-inch glass baking dish. Sprinkle salmon with salt and pepper; add to baking dish and turn to coat. Let salmon marinate at least 15 minutes and up to 30 minutes. Mix yogurt, tahini, 1 tablespoon oil, 1 tablespoon lemon juice, 1 garlic clove, and 1/2 teaspoon lemon peel in small bowl. Stir in half of herb mixture. Position 1 rack in top third and 1 rack in bottom third of oven; preheat to 400°F. Brush 2 large rimmed baking sheets with oil. Toss potatoes, carrots, remaining coriander, and 2 tablespoons oil in large bowl. Spread potato mixture on 1 baking sheet; sprinkle with salt and pepper. Roast on top oven rack until almost tender, about 18 minutes. Meanwhile, arrange salmon on second oiled sheet. Toss snap peas with remaining marinade in dish; stir into potato mixture. Transfer sheet with potato mixture to lower oven rack. Place sheet with salmon on upper oven rack. Roast salmon until just opaque in center and vegetables until tender, about 8 minutes. Transfer salmon to platter. Mix remaining herb mixture into vegetables; spoon vegetables around salmon. Garnish with lemon wedges; serve with yogurt sauce. Available at some supermarkets, natural foods stores, and Middle Eastern markets.
Preparation Toss green onions, dill, cilantro, and mint in small bowl. Set herb mixture aside. Toast coriander seeds in small dry skillet over medium heat until slightly darker in color and fragrant, about 2 minutes. Cool. Crush in mortar with pestle, or place in plastic bag and coarsely crush with mallet or rolling pin. Whisk 1 tablespoon oil, 1 tablespoon lemon juice, 1 garlic clove, 1/2 teaspoon lemon peel, and half of crushed coriander in 11x7x2-inch glass baking dish. Sprinkle salmon with salt and pepper; add to baking dish and turn to coat. Let salmon marinate at least 15 minutes and up to 30 minutes. Mix yogurt, tahini, 1 tablespoon oil, 1 tablespoon lemon juice, 1 garlic clove, and 1/2 teaspoon lemon peel in small bowl. Stir in half of herb mixture. Position 1 rack in top third and 1 rack in bottom third of oven; preheat to 400°F. Brush 2 large rimmed baking sheets with oil. Toss potatoes, carrots, remaining coriander, and 2 tablespoons oil in large bowl. Spread potato mixture on 1 baking sheet; sprinkle with salt and pepper. Roast on top oven rack until almost tender, about 18 minutes. Meanwhile, arrange salmon on second oiled sheet. Toss snap peas with remaining marinade in dish; stir into potato mixture. Transfer sheet with potato mixture to lower oven rack. Place sheet with salmon on upper oven rack. Roast salmon until just opaque in center and vegetables until tender, about 8 minutes. Transfer salmon to platter. Mix remaining herb mixture into vegetables; spoon vegetables around salmon. Garnish with lemon wedges; serve with yogurt sauce. Available at some supermarkets, natural foods stores, and Middle Eastern markets.