Soak the cashews for the Creamy Cilantro Sauce for at least 30 minutes while making the remainder of the recipe (for a high speed blender), or soak them overnight or the morning of if you think of it. The longer the better! (You also can make the sauce ahead — see instructions in the cilantro sauce recipe!).
Place the lentils in a pot with 6 cups warm water. Bring to a low boil, then boil for about 15 to 20 minutes until just al dente (taste often to assess doneness). Drain, then stir in the olive oil, cumin, garlic powder, and kosher salt.
Warm the tortillas according to the package instructions*. (We typically char ours on an open flame.) To serve, top the tortillas with lentils, green onions, green cabbage, salsa verde, torn cilantro leaves, and cilantro drizzle. Store leftover lentils up to 5 days refrigerated.