Roasted Veggies Toasts

Ingredients

• ¼ cup olive oil, plus more for drizzling
• 1 ½ tablespoons apple cider vinegar
• Sea salt and black pepper
• 1 large potato, peeled, cut into 1-inch chunks
• 2 medium carrots, peeled and cut into 1-inch chunks
• 1 medium yellow squash, cut into 1-inch chunks
• 1 medium red onion, cut into 1-thick-wedges
• 4 Italian sausages
• 1 medium ciabatta or sourdough, cut crosswise 1-inch thick
• 50g un-salt butter
• 150g fresh parmesan cheese, cut into ½ -inch cubes
• 10 mint leaves