Stir coriander, cumin, mustard seeds, and 2 Tbsp. oil in a medium saucepan over medium-high heat until sizzling, about 1 minute. Add onion and garlic; cook, stirring often, until just softened, about 5 minutes. Add lentils and 3 cups broth; bring to a boil. Reduce heat and simmer, partially covered, adding broth as needed to keep lentils covered, until lentils are soft, 30–40 minutes. Stir in lemon juice; season with salt and pepper.