1. Cook the pasta according to package instructions until it is al dente.
2. While the pasta is cooking, heat olive oil in a large skillet over medium heat.
3. Add chopped onion and garlic to the skillet and cook for 2-3 minutes or until the onions are translucent and fragrant.
4. Stir in the fresh spinach leaves and cook for another minute or until the leaves are wilted and slightly softened.
5. Remove the skillet from heat and add toasted pine nuts, salt, and black pepper to taste.
6. Once the pasta is done, drain it and reserve 1 cup of pasta cooking water.
7. Add the cooked pasta to the skillet with the wilted spinach and toss to combine.
8. If needed, add some of the reserved pasta cooking water to adjust the consistency of the dish.
9. Serve the orzo hot, garnished with freshly grated Parmesan cheese.
Enjoy your delicious and healthy orzo with wilted spinach and pine nuts! This dish is perfect for a light lunch or dinner, and it's also great as a side dish for any meal. You can even add some cooked chicken or shrimp to make it a complete meal.