INGREDIENTS
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2 1/2 cups zucchini noodles
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1 large yellow onion, sliced thinly
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1 teaspoon granulated sugar
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1 teaspoon fresh thyme, chopped
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1 tablespoon butter
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1/4 cup beef broth
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2 teaspoons Worcestershire sauce
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1 cup fontina cheese, grated
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salt and pepper to taste