Start by making the couscous: add the water, salt, and butter to a pot. Bring to a boil, then stir in the couscous. Cover the pot and lower the heat. Cook on low heat for 8 to 10 minutes, stirring occasionally.
Once done cooking the couscous, remove from heat and add the spinach and feta cheese. Stir until incorporated and the feta cheese has melted.
For the full step-by-step instructions and video tutorial, download the Little Lunches app.