Step 1

Place the cashews in a bowl and cover them with boiling water. Soak for 1 hour.

Step 2

Bring a large pot of water to a boil and add the spinach. Cook until bright green and wilted, about 2 minutes. (If using frozen spinach, it might take a few more minutes to thaw.) Pour the spinach into a colander and apply pressure to the top to remove all of the liquid. Transfer the spinach to a cutting board and coarsely chop it. If there’s still a lot of liquid coming out, place a towel over the top and apply pressure to soak up any remaining water.

Step 3

Heat the olive oil in the same pot over medium-high heat. Add the onion and garlic and sauté for 5 minutes. Add the spinach and cook for 5 minutes more.

Step 4

Meanwhile, drain the cashews and add them to a blender with the water, lemon juice, vinegar, salt, and nutmeg. Blend on high for about 1 minute, until very smooth.

Step 5

Stir the cashew cream into the spinach mixture, then remove from the heat. Serve immediately.