In a large saucepan, put 2 ½ cups butternut squash and ½ cup red lentils to boil in 2-3 cups salted cold water.
When the squash is very tender and the lentils are mostly exploded, turn off the heat.
Blend the whole thing until very creamy. I use an immersion blender and do it directly in the pot on the counter (not over the stove).
Add salt and black pepper to taste if you want.
Add ¼ cup almond or cashew milk and mix it in before serving, or drizzle it over.
Refrigerate leftovers.
Notes
Liquid: depending on how you like your soup (thicker or thinner) is the amount of water you'll need. I recommend you start with 2 cups and then add more at the end if you see it is consuming too fast before the squash is done. Milk: you can use any nut milk, but I find almond is the best and second comes cashew. Alternatively, use cream (whipping or double, directly from the fridge) if not making it vegan.