How to Make It
Heat a large pot. Add the greens and cook over high heat, tossing just until wilted. Transfer the greens to a colander and press out the excess liquid.
Wipe out the pot. Add the olive oil and heat until shimmering. Add the pancetta and cook over moderately high heat, turning once until crisp, about 6 minutes. Using a slotted spoon, transfer the pancetta to a plate.
Add the garlic and crushed red pepper to the pot and cook over high heat, stirring, until fragrant and lightly browned, about 30 seconds. Add the greens, season with salt and cook over high heat for 2 minutes, stirring occasionally. Transfer the greens to a bowl. Crumble the pancetta on top and serve.