To save cooking time: use tender cuts of meat in stews, like the pork tenderloin here. Fast Pork Recipes
Season the pork with salt and pepper. In an enameled cast-iron casserole, heat 1 tablespoon of the oil. Brown the pork in 2 batches over high heat, about 2 minutes per side; transfer to a plate.
Add the remaining 1 tablespoon oil to the casserole; reduce the heat. Add the garlic and cook, mashing and stirring it, until soft and golden, about 4 minutes. Add the onions and rosemary. Cook, stirring, until the onions soften, about 5 minutes. Add the wine; simmer until almost evaporated, about 4 minutes. Add the potatoes and stock; season with salt and pepepr. Bring to a boil, cover and boil gently until the potatoes are tender, about 20 minutes.
Add the pork to the stew; simmer for 2 minutes. Add the escarole in 2 parts and cook, stirring, until wilted but still bright green and the pork is cooked through, about 2 minutes. Serve hot.
The pork stew can be made a day ahead; be careful not to overcook when reheating.