Heat olive oil in a large pot or Dutch oven over medium heat. Add the chopped onion and sauté until softened, about 5-7 minutes.
Add the minced garlic and dried oregano, and cook for another minute until fragrant. Be careful not to burn the garlic.
Stir in the Arborio rice and toast it for 1-2 minutes, stirring constantly, until the edges of the grains are translucent.
Pour in the vegetable broth and bring to a boil. Then, reduce the heat to low, cover, and simmer for 15-20 minutes, or until the rice is tender and most of the liquid has been absorbed. Stir occasionally.
Stir in the fresh lemon juice, salt, and black pepper. Taste and adjust seasoning as needed.
Serve the lemon rice hot, garnished with fresh chopped parsley and crumbled feta cheese if desired.
Notes
This lemon rice is wonderfully versatile and pairs well with grilled meats, fish, or as a standalone vegetarian dish.