Smashed pea and crispy prosciutto brushetta

Ingredients

• 6 slices ciabatta bread or similar
• olive oil for brushing, plus ¼ cup for topping
• 1 cup fresh or frozen shelled peas, blanched
• 1 clove garlic, diced
• 1 teaspoon lemon zest
• sea salt and cracked pepper
• 5 slices prosciutto
• 1 large or 6 small balls fresh mozzarella, roughly torn