How to Make It
In a large nonstick skillet, heat 2 tablespoons of the olive oil. Add the onion and cook over moderate heat, stirring occasionally, until deeply golden, about 15 minutes. Stir in the remaining 1 tablespoon of oil and the spinach and stir until wilted. Transfer to a medium bowl and let cool to room temperature.
Stir the yogurt, chives and nutmeg into the spinach and onion and season the dip with salt and pepper. Serve with crackers.