Salmon with lentils

Ingredients

• 1/2 pound French green lentils such as du Puy
• 1/4 cup good olive oil, plus extra for salmon
• 2 cups chopped yellow onions
• 2 cups chopped leeks, white and light green parts only
• 1 teaspoon fresh thyme leaves
• 1 teaspoon kosher salt
• 3/4 teaspoon freshly ground black pepper
• 1 tablespoon minced fresh garlic
• 1 1/2 cups chopped celery (4 stalks)
• 1 1/2 cups chopped carrots (3 carrots)
• 1 1/2 cups Homemade Chicken Stock or good canned broth
• 2 tablespoons tomato paste
• 2 tablespoons good red wine vinegar
• 4 (8-ounce) center-cut salmon fillets, skin removed
• recipeIngredient ends