Start by cooking the lentils according to package instructions. After they have finished cooking, mix the taco seasoning with 1 tablespoon water and mix into the lentils until the flavors are evenly distributed.
While the lentils are cooking, prep the veggies according to ingredient list.
Heat the tortillas one at a time on a pan over medium heat for about 30 seconds on each side.
Assemble the tacos by adding a layer of lettuce to each tortilla followed by the lentils and then the remaining ingredients.
Notes
If you plan on saving these tacos for later, store the cooked lentils, tortillas, and raw ingredients in their own containers to make reheating much easier.