Step 1

In a large pot of salted boiling water, blanch the Swiss chard leaves and stems for 1 minute. Drain and cool under running water. Drain well and pat dry.

Step 2

In a small saucepan, melt the butter over moderately low heat. Whisk in the lemon juice and season with salt and black pepper; keep warm.

Step 3

Season the pork with salt and black pepper. Place 1 slice of prosciutto on each chop, folding the slices to fit. Press the sage leaves onto the prosciutto, then dust the pork with Wondra flour.

Step 4

In a very large skillet, heat the olive oil until shimmering. Carefully add half of the pork, prosciutto side down, and press with a spatula. Cook over high heat until golden on the bottom, about 2 minutes. Flip the pork and cook until barely pink throughout, about 1 minute longer. Transfer the saltimbocca to a serving platter and tent with foil. Repeat with the remaining pork chops.

Step 5

Pour off all but 2 tablespoons of the oil from the skillet. Add the garlic and crushed red pepper and cook over moderate heat until fragrant, 1 minute. Add the Swiss chard and cook, tossing, until heated through. Season with salt and black pepper. Transfer the Swiss chard to plates and top with the saltimbocca. Drizzle the lemon butter over the meat and serve right away.