The Best Spinach Lasagna Recipe

For the Spinach: Heat olive oil and butter in a large saucepan over medium heat until melted. Add shallots and garlic, season with salt and pepper, and cook, stirring frequently, until softened and fragrant, about 1 minute. Add a few large handfuls of spinach and cook, stirring, until wilted. Continue adding spinach a handful at a time until it is all in the pot. Cook, stirring frequently, until spinach expels its moisture and most of that moisture evaporates, leaving a dry bottom as you stir. Season to taste with salt and pepper.