Preheat the oven to 425 degrees. In a large bowl, toss the eggplant with 1/4 cup olive oil and coriander until coated, season with half of salt and pepper.
Arrange in a layer on a large rimmed baking sheet (use silicone mat to help with clean up). Roast until eggplant is tender and golden brown, 25 minutes.
Meanwhile, in a large skillet, heat another 2 tbsp oil over medium heat. Add the carrot and onion. Season with other half of salt and pepper. Saute, stirring, until vegetables are softened, about 2-3 minutes.
Stir in the garlic and tomato paste and cook, stirring, until tomato paste begins to dark a bit, about 3-4 minutes.
Stir in the lentil until coated. Pour in stock and bring to a low boil over high heat. Lower to low and simmer until the lentils are tender, uncovered, about 30 minutes.
Stir in the orzo/pasta and cook 8-10 minutes. Remove from heat and stir in the lemon zest and juice. Don't skip this step-- they are essential to finish the dish!
Spoon the stew onto plates, top with the roasted eggplant and feta. Garnish with lemon wedges for squeezing if desired. Enjoy!