INGREDIENTS
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3 leeks, white and light-green parts only
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1 tablespoon extra-virgin olive oil
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3 carrots, peeled and cut into 1/4-inch-thick slices
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1 small fennel bulb, trimmed and cut into wedges, fronds reserved for garnish
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2 celery stalks, cut crosswise into 1/4-inch slices
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4 sprigs fresh flat-leaf parsley
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4 sprigs fresh thyme
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One 14 1/2-ounce can fat-free vegetable stock
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2 teaspoons coarse salt
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1/2 teaspoon freshly ground pepper
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One 1-pound salmon fillet, skin removed, cut into 1-inch cubes
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1 bunch (about 3 ounces) spinach, washed and cut into 1 1/2-inch-wide strips