To make the vegetable mixture: Combine all of the ingredients in shallow roasting pan and toss to mix. Spread the mixture out to form a bed for the salmon.
To make the salmon: In a small bowl, mix the fronds, basil, mustard, salt, and pepper. Rub each salmon fillet with the mixture and arrange them over the top of the vegetables. Drizzle the fillets with the vermouth and lemon juice.
Combine the melted butter and pecans in a small bowl, and top each fillet with the mixture. Roast the salmon until just cooked thorough and the vegetables are tender, about 15 to 17 minutes. Serve immediately.