How to Make It
In a small bowl, combine the parsley, minced garlic, lemon zest, 3 tablespoons of the lemon juice and 6 tablespoons of the olive oil. Season with salt and black pepper and mix well.
In a large pot, heat 2 tablespoons of the olive oil. Add the shallots and sliced garlic and cook over moderate heat, stirring occasionally, until light golden, about 5 minutes. Add the green cabbage, collard greens and the remaining 2 tablespoons of olive oil and season with salt and black pepper. Cook over moderately high heat, stirring, until the collards and cabbage are wilted and crisp-tender, 7 to 8 minutes. Stir in the crushed red pepper and the remaining 1 tablespoon of lemon juice. Transfer the greens to a platter, top with the gremolata and serve.