"Everything you love about French Onion soup, compressed between two pieces of bread: sweet caramelized onions cooked in rich beef stock, Gruyère, and fresh thyme. A two-for-one soup and a sandwich...."
INGREDIENTS
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2 tablespoons unsalted butter
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2 yellow onions, halved, thinly sliced into half-moons
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Kosher salt, to taste
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Large pinch sugar
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1/2 cup beef stock
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2 teaspoons thyme leaves
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4 slices round white bread, such as Tuscan bread, toasted
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2 teaspoons canola oil
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3 ounces sliced or shaved Gruyère