1. Place spinach and 1/4 cup water in large microwave-safe bowl. Cover bowl with large dinner plate (plate should completely cover bowl and not rest on spinach). Microwave on high power until spinach is wilted and decreased in volume by half, 3 to 4 minutes. Using potholders, remove bowl from microwave and keep covered for 1 minute. Carefully remove plate and transfer spinach to colander set in sink. Using back of rubber spatula, gently press spinach against colander to release excess liquid. Transfer spinach to cutting board and roughly chop. Return spinach to colander and press a second time.

2. Heat butter in 10-inch skillet over medium heat until foaming subsides. Add leeks and cook, stirring occasionally, until softened, 10 to 15 minutes, adding 1 teaspoon water to skillet if leeks begin to color. Add spinach to skillet, using tongs to stir and coat with butter. Sprinkle with 1/4 teaspoon salt, lemon zest, and nutmeg; continue stirring with tongs until spinach is uniformly wilted and glossy green, about 2 minutes. Drizzle with lemon juice and cream; stir to combine. Sprinkle with hazelnuts and season with salt to taste. Serve immediately.

Serves 4