Marinate the Shrimp: In a bowl, combine the olive oil, lemon juice, garlic, parsley, salt, and pepper. Add the shrimp and toss to coat. Let marinate for 20-30 minutes.
Cook the Farro: Rinse the farro under cold water. Bring 3 cups of water to a boil, then add the farro. Reduce the heat and simmer for 20-30 minutes, until the farro is tender but still chewy. Drain any excess water, fluff with a fork, and season with olive oil, salt, and pepper.
Roast the Vegetables: Preheat the oven to 400°F (200°C). Toss the sliced carrots, zucchini, bell pepper, and onion with olive oil, salt, and pepper. Spread the vegetables on a baking sheet and roast for 20-30 minutes, stirring halfway through, until tender and caramelized.
Grill the Shrimp: Preheat the grill to medium-high heat. Grill the shrimp for 2-3 minutes per side, until they are opaque and lightly charred.
Assemble the Dish: Spoon the farro onto a plate and top with the grilled shrimp and roasted vegetables. Garnish with fresh herbs and a drizzle of lemon juice.