Grown Up Grilled Cheese Sandwiches

Ingredients

• 2 Tbs. olive oil, plus more for brushing
• 1 large yellow onion, sliced 1/4 inch thick
• Kosher salt and freshly ground pepper, to taste
• 8 slices sweet batard, cut on the bias 1/2 inch thick
• 4 tsp. Dijon mustard
• 10 oz. Gruyère cheese, sliced
• 1/2 oz. arugula
• Smoky Lentil Soup for serving

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