Cook the rice according to the package directions.
While the rice is cooking, lightly toast the pine nuts in a toaster oven or conventional oven, and set them aside.
Meanwhile, in a large skillet, sauté the garlic in olive oil over medium heat for about 30 seconds (but don't let it brown). Add the spinach and a pinch of salt, stir, and cover the pan. Steam the spinach for about 3 minutes or until it is just limp. Reduce the heat to low. Top the spinach with the lemon juice, pine nuts and raisins or currants (optional), and stir it gently until it is warmed through. Season it with salt and pepper.
Serve the rice in bowls, topped with the spinach, and then sprinkle the feta cheese over everything.
Tip: To toast pine nuts, bake them in a preheated 350 degree toaster or conventional oven until they are golden, about 3-5 minutes (watch them carefully so they don't burn).