01 - Preheat oven to 425°F (220°C) and line a baking sheet with parchment paper.
02 - In a large mixing bowl, combine sweet potato, red bell pepper, zucchini, and red onion. Add olive oil, smoked paprika, cumin, salt, and pepper. Toss thoroughly to coat. Arrange vegetables in a single layer on the lined baking sheet.
03 - Roast the vegetables for 30 to 35 minutes, stirring once halfway through, until tender and caramelized.
04 - While vegetables roast, place lentils, water or vegetable broth, and bay leaf in a medium saucepan. Bring to a boil over medium-high heat, reduce to a gentle simmer, and cook uncovered for 20 to 25 minutes until lentils are tender but retain their shape. Discard bay leaf, stir in salt, and drain any excess liquid if necessary.
05 - In a small bowl, whisk together tahini, lemon juice, maple syrup, minced garlic, and 2 tablespoons water until smooth. Add additional water to adjust consistency as preferred. Season with salt and pepper.
06 - Divide cooked lentils among four serving bowls. Top each portion with roasted vegetables, drizzle with tahini dressing, and garnish with parsley and toasted sesame seeds.