Cook your lentils: Put lentils, water, and 1 teaspoon salt in your saucepan. Boil them, then turn heat down and simmer 20-25 minutes until tender.
Prep sweet potatoes: Toss diced sweet potatoes with 2 tablespoons olive oil and all spices on your sheet pan until coated well.
Roast them up: Bake sweet potatoes at 400°F for 20-25 minutes until golden and tender, stirring once halfway through cooking.
Make the dressing: Whisk olive oil, balsamic vinegar, mustard, maple syrup, and spices together in a small bowl until smooth.
Mix everything: Combine warm, drained lentils, roasted sweet potatoes, garlic, onion, parsley, and cilantro in your big serving bowl.
Dress and serve: Pour dressing over everything, toss gently to coat, then taste and add more salt or pepper if needed.