Gnocchi Ravioli with Sausage-Spinach Filling - Lidia

Ingredients

• 1 batch Basic Potato Gnocchi (see here)
• For the filling
• 3 tablespoons butter
• 1 onion, chopped (about 1 cup)
• 1 teaspoon coarse sea salt or kosher salt
• 5 ounces sweet Italian sausage, removed from casing and crumbled
• 4 ounces ground veal
• 1 pound tender fresh spinach leaves, rinsed well and drained
• For cooking and dressing the offelle
• Coarse sea salt or kosher salt for the pasta pot
• 12 tablespoons butter
• 8 large fresh sage leaves (or more smaller leaves)
• Freshly ground black pepper to taste
• 1 cup freshly grated Grana Padano