How To Make French Onion Soup in the Slow Cooker

How To Make French Onion Soup in the Slow Cooker was pinched from <a href="http://www.thekitchn.com/how-to-make-french-onion-soup-in-the-slow-cooker-start-to-finish-cooking-lessons-from-the-kitchn-215696" target="_blank">www.thekitchn.com.</a>
INGREDIENTS
3 pounds yellow onions, peeled, sliced, and cut into quarter-moons
2 tablespoons unsalted butter, melted
2 tablespoons olive oil
1 teaspoon salt, plus more to taste
2 tablespoons balsamic vinegar
10 cups beef broth
3 tablespoons brandy, optional
4 to 6 baguette slices, toasted, for each bowl
1 1/3 to 2 cups grated Gruyere cheese (1/3 cup per bowl)
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