Spinach & Ricotta Stuffed Shells with Spicy Chorizo - Montecatini Specialty Smallgoods

Ingredients

• 12 ounces jumbo pasta shells about 25 to 30 shells
• 1 tablespoon olive oil plus more for the pan
• 1 medium yellow onion finely chopped
• 8 ounces fresh chorizo or spicy pork sausage removed from casing and crumbled
• 1 (28 ounce) can crushed or pureed tomatoes
• 1 1/2 teaspoons granulated sugar
• Kosher salt and Freshly ground black pepper
• 3 ounces spinach or chard stemmed and leaves finely chopped
• 1 (15 ounce) container whole milk ricotta cheese
• 1 cup shredded low-moisture mozzarella
• 1 large egg lightly beaten