This hearty Harvest Vegetable Casserole is a wholesome, plant-based main dish that celebrates the flavors of autumn. Tender pearl barley absorbs the rich, savory beef bouillon broth, creating a satisfying base for a colorful mix of fresh vegetables. Crisp-tender cauliflower, carrots, and green beans mingle with earthy peas and sweet zucchini, while caramelized onions and peppers add depth. A bright splash of lemon juice and aromatic garlic cuts through the richness, balancing the warm paprika spice. Perfect for chilly evenings, this casserole offers a rustic, home-cooked comfort that appeals to the whole family. It’s an excellent way to use up garden produce or pantry staples, delivering a nutritious and fiber-rich meal that feels indulgent yet healthy. Serve it straight from the oven with crusty bread to soak up the flavorful juices.