Step 1

Pour enough oil in a heavy large saucepan to reach the depth of 3 inches. Heat the oil over medium heat to 350 degrees F.

Step 2

Stir the eggs, risotto, Parmesan, and 1/2 cup of the bread crumbs in a large bowl to combine. Place the remaining breadcrumbs in a medium bowl. Using about 2 tablespoons of the risotto mixture for each, form the risotto mixture into 1 3/4-inch-diameter balls. Insert 1 cube of mozzarella into the center of each ball. Roll the balls in the bread crumbs to coat.

Step 3

Working in batches, add the rice balls to the hot ail and cook until brown and heated through, turning them as necessary, about 4 minutes. Using a slotted spoon, transfer the rice balls to paper towels to drain. Season with salt. Let rest 2 minutes. Serve hot.

Step 4

Bring the broth to a simmer in a heavy medium saucepan. Add the porcini mushrooms. Set aside until the mushrooms are tender, about 5 minutes. Keep the broth warm over very low heat.

Step 5

Melt the butter in a heavy large saucepan over medium heat. Add olive oil. Add the onions and saute until tender, about 8 minutes. Add the white mushrooms and garlic. Using a slotted spoon, transfer the porcini mushrooms to a cutting board. Finely chop the mushrooms and add to the saucepan. Saute until the mushrooms are tender and the juices evaporate, about 5 minutes. Stir in the rice and let it toast for a few minutes. Add the wine; cook until the liquid is absorbed, stirring often, about 2 minutes. Add 1 cup of hot broth; simmer over medium-low heat until the liquid is absorbed, stirring often, about 3 minutes. Continue to cook until the rice is just tender and the mixture is creamy, adding more broth by cupfuls and stirring often, about 28 minutes (the rice will absorb 6 to 8 cups of broth). Stir in the peas. Mix in the Parmesan. Season with salt and pepper, to taste.