Heat olive oil over medium heat in a large skillet. Add the onion and pepper and cook for 5 minutes, until onion is translucent.
Add the zucchini and corn and cook until zucchini is tender, another 3-4 minutes.
Add the lentils, taco seasoning and vegetable broth, stirring occasionally until thick and heated through. Season to taste with salt and pepper, as needed.
While the lentils are cooking, make the sauce.
Place all ingredients in a high-powered blender or food processor and puree until creamy and smooth.
Divide lentil mixture among tortillas and serve with lime sauce.