Low FODMAP “Onion” Soup

Name: Low FODMAP “Onion” Soup
Prep time: 10 min
Cook time: 1 h 10 min
Total time: 1 h 20 min
Cuisine: American, French
Ingredients: 4 tablespoons (57 g) unsalted butter, (cut into pieces); 2 tablespoons extra-virgin olive oil or Garlic-Infused Oil,; 3 to 4 leeks, (with a generous amount of greens to yield 8 ounces/225 g of finely chopped greens); 3 (about 20 beefy ones to yield 4 1/4 ounces/120 g) large bunches of scallions, (finely chopped greens); 2 quarts (2 L) beef stock, homemade or purchased low FODMAP beef stock; 4 sprigs fresh flat leaf parsley; 2 small springs fresh thyme; 1 bay leaf; Kosher salt; Freshly ground black pepper; 8 slices low FODMAP gluten-free baguette; 12 ounces (340 g) Swiss or Gruyere cheese, (shredded)