French Onion Soup

Name: French Onion Soup
Ingredients: 1 garlic clove, halved; 1 bay leaf, scored; 2 thyme sprigs; 6 cups veal stock or beef stock (homemade or store-bought, see note below); 4 medium onions, cut into 1/2-inch-thick slices; 6 tablespoons grapeseed oil; 1/4 cup unsalted butter; 1/4 cup dry sherry; 2 teaspoons Worcestershire sauce; 20 (1-inch) croutons, to cover soup; 16 slices Emmental or Gruyère cheese