INGREDIENTS
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2 Tbsp oil
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2 large onions, diced
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1/2 lb Swiss cheese, grated
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1/2 lb Gruyére cheese, grated
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2 Tbsp flour
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3/4 cup beef broth
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1/4 cup cooking sherry
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1/2 Tbsp concentrated beef broth
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Pinch of nutmeg
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2 loaves French bread, cut into 1'' cubes and toasted (optional, for serving)
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Cooked asparagus spears (optional, for serving)
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Cooked potatoes, cubed (optional, for serving)
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Cooked broccoli, roughly diced (optional, for serving)
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Cooked cauliflower, roughly diced (optional, for serving)