Cook the oats and lentils: Bring the water to a simmer in a medium saucepan. Add the oats and lentils. Simmer over low heat for about 20 minutes or until the desired creaminess, stirring occasionally and scraping along the bottom to prevent sticking.
Add the nondairy milk if using. Stir to combine.
Make the green miso sauce: Transfer the walnuts, kale, basil, miso, garlic, lemon juice, water, and dates to a blender. Blend on high until mostly smooth.
For serving, heat the lentil oats until warmed through. Remove from the heat. Mix in the desired amount of green sauce. Top with longevity foods.
