Italian-Style Sandwiches

Ingredients

• 4 mild Italian sausages
• As required olive oil
• 1 red onion, sliced thinly
• 15 ml / 1 tbsp balsamic vinegar
• 4 ciabatta rolls, halved and toasted
• 500 ml / 2 cups wild arugula
• 5 ml / 1 tsp balsamic vinegar
• To taste salt and freshly ground pepper
• 2 red tomatoes, sliced
• 8 bocconcini balls, sliced thinly