If you have prepared lentils you can skip this step. If not rinse 1 cup of dry lentils. Cook on stovetop with 3 cups of water. Bring to a boil cover and simmer for 20 minutes or until lentils are soft. Lentils will double in size. Be sure to use a large enough pot.
In a large skillet add 1 tablespoon of olive oil add onions garlic and diced peppers. Sauté until soft about 3 minutes.
Add spices to onion mixture. Sauté an additional minute.
Add cooked lentils.
Assemble tacos. Add avocado tomatoes cilantro and any additional toppings you desire.