Leek and Salmon Soup

Ingredients (14)

• + 2 tablespoons vegetable oil add to pantry
• + 3 leeks, white and light green parts only, thinly sliced add to pantry
• + 2 small yellow onions, thinly sliced add to pantry
• + 2 shallots, thinly sliced add to pantry
• + 4 cloves garlic, minced add to pantry
• + 1 teaspoon salt add to pantry
• + 5 cups vegetable stock, divided add to pantry
• + 2 large yellow potatoes, sliced add to pantry
• + 1 small head cauliflower, broken into small florets add to pantry
• + 2 carrots, sliced add to pantry
• + 1 cup heavy cream add to pantry
• + 1 pound skinless salmon fillet, cut into large chunks add to pantry
• + salt and cracked black pepper to taste add to pantry
• ✓ ½ (2.8 ounce) package French-fried onions, or to taste