Make the sauce: In a small bowl, whisk together 4 tablespoons vegetable broth, 2 tablespoons extra virgin olive oil, 2 tablespoons lemon juice, 1 tablespoon tomato paste, 2 cloves garlic, 1 teaspoon dried oregano, ½ teaspoon salt, and black pepper. Set aside.
Cook the onion and mushrooms: Heat 1 tablespoon extra virgin olive oil in a large skillet over medium heat. Add 1 medium onion (chopped) and 10 ounces mushrooms (sliced), season with a pinch of salt, and cook for 5 minutes stirring often until they start to brown.
Add the lentils and rice: Stir in 2 cans lentils (drained and rinsed) and the 1½ cups cooked rice. Cook for 1 minute to warm everything through.
Pour in the sauce: Pour the stir fry sauce into the skillet. Cook on medium-high heat, stirring often, until everything is coated and you smell a fragrant garlic aroma.
Add the spinach: Add the spinach and stir for 1 minute, or until it wilts and blends into the stir fry. Taste and adjust with more salt, pepper, or lemon juice. Serve right away with extra fresh parsley and yogurt on top.
