Sausage and Parmesan Arancini

Name: Sausage and Parmesan Arancini
Cook time: 1 h 40 min
Total time: 1 h 40 min
Cuisine: European, Italian, Mediterranean
Ingredients: 5 tablespoons olive oil; 2 Italian sausage links, casings removed and meat crumbled; 1 1/4 cups diced Spanish onion (about 1 small or 1/2 large); Kosher salt and freshly ground black pepper; 24 to 32 ounces chicken stock; 1 1/2 cups arborio rice; 1 cup white wine; 1 cup grated Parmesan; 1/4 cup chopped fresh chives, plus more for garnish; 1 1/2 tablespoons unsalted butter; Vegetable oil, for frying; 2 cups all-purpose flour; 1 dozen large eggs, beaten; 2 cups panko breadcrumbs, ground in a food processor; Pecorino-Romano, for garnish; Spicy marinara (store-bought or homemade), for dipping, optional; Chimichurri Sauce (recipe follows), for dipping, optional; 2 bunches scallions; 1/2 cup olive oil; 1/4 to 1/2 cup sherry vinegar; 2 tablespoons finely minced fresh chives; 2 tablespoons finely minced fresh parsley; 2 tablespoons finely minced shallots; 1 teaspoon finely minced garlic