Spinach Frittata With Raisins and Pine Nuts

Heat the oil in a small frying pan over medium heat. Add the pine nuts and cook, stirring occasionally, until golden and fragrant, 2 to 3 minutes. Add the raisins and cook, stirring often, for about 1 minute, then stir in the oregano, lemon zest, and a small sprinkling of salt. Remove from the heat and set aside.

Preheat the oven to 375°F.

Heat the oil in a medium nonstick, ovenproof frying pan over medium heat. Add the onion and cook, stirring occasionally, until softened and lightly browned, 6 to 8 minutes. Add the spinach, raise the heat to medium-​high, and cook, stirring often, until the spinach wilts and any water it releases evaporates, 5 to 7 minutes. Add the garlic and cook, stirring, until fragrant, about 1 minute.