Arancini with ham and peas

Ingredients

• 3 cups chicken stock
• 2 tablespoons extra virgin olive oil
• 1 small yellow onion, minced
• 1 1/2 cups Italian arborio rice
• 1/2 cup homemade tomato sauce
• 2/3 cup grated Parmigiano, caciocavallo or pecorino cheese
• 1 egg yolk, beaten
• Salt and freshly ground black pepper
• 3-ounce slice ham, cut into 1/8-inch dice
• 1/2 cup peas, boiled in water 10 seconds
• 4 ounces fresh mozzarella, cut into 1/4-inch dice