Ingredients

1 tablespoon olive oil

1 small red onion, diced small

1/2 teaspoon red-pepper flakes

1 head escarole, cored and chopped

Coarse salt and ground pepper

Juice of 1/2 lemon

Preparation

In a large skillet, heat olive oil over medium-high. Add red onion and red-pepper flakes; cook until onion softens, 3 minutes. Add escarole. Cook until wilted, 3 minutes. Season with salt, pepper, and lemon juice.