Italian Sausage, Broccoli, and Parmesan Sandwiches on Garlic Ciabatta

Ingredients

• 1 organic red onion
• 2 tablespoons red wine vinegar
• Sausage options:
• 2 fresh mild Italian pork sausages (about ¼ pound each)
• 2 fresh chicken sausages with roasted peppers and garlic (about ¼ pound each)
• 1 or 2 cloves organic peeled fresh garlic
• 2 ciabatta rolls
• ¼ pound organic broccoli
• 1 teaspoon red chile flakes (optional)
• 3 ounces organic baby arugula or other leafy greens
• 3 tablespoons grated Parmesan