Grilled Sausage and Balsamic Onion Sandwich Recipe

Ingredients

• 1 large red onion, sliced crosswise into 1/4-inch disks
• 5 Tbs. olive oil
• 1 Tbs. plus 1 tsp. good balsamic vinegar
• Kosher salt and freshly ground black pepper
• 1 large ripe tomato (about 8 oz.), thinly sliced
• 8 slices (about 1/2-inch thick each) crusty Italian bread or 4 ciabatta rolls
• 1 clove garlic, smashed
• 4 links sweet or hot Italian sausage (about 1 lb. total)
• 1 packed cup arugula, washed (if the leaves are large, stem them)
• 2 to 3 Tbs. freshly grated Parmigiano-Reggiano
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