Cook the lentils: Combine the rinsed lentils and vegetable broth (or water) in a saucepan. Bring to a boil, then reduce heat, cover, and simmer for 20-25 minutes, or until tender. Drain any excess liquid and set aside.
Roast the vegetables: Preheat your oven to 400°F (200°C). On a large baking sheet, toss the chopped root vegetables and red onion with 2 tablespoons of olive oil, thyme, salt, and pepper. Spread them in a single layer.
Roast for 25-30 minutes, stirring halfway through, until the vegetables are tender and slightly caramelized.
Prepare the dressing: In a small bowl, whisk together the 1/4 cup olive oil, apple cider vinegar, Dijon mustard, and maple syrup. Season with salt and pepper.
Assemble the salad: In a large bowl, combine the cooked lentils, roasted vegetables, and fresh parsley.
Pour the dressing over the salad and toss gently to coat everything evenly.
Serve warm or chill for later meal prep.
Notes
You can substitute the root vegetables with broccoli, Brussels sprouts, or butternut squash based on what you have available.
For extra flavor, add 1/2 cup of toasted pecans or walnuts when assembling.
This salad keeps well in the refrigerator for up to four days, making it excellent for lunch planning.