Preheat oven to 400°F. In bowl, combine tomatoes, onion, parsley, thyme, salt and pepper. Pour olive oil into 2-quart shallow baking dish, tilting to coat evenly. Add tomato mixture. Bake 5 minutes.
Add salmon steaks to baking dish; drizzle lemon juice over all. Bake 10 minutes more or until fish flakes when tested with a fork.
To serve, place salmon on plate and spoon tomato mixture over all. Garnish with fresh lemon slices.
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