Directions

1. In a large pot of boiling salted water, cook pasta until al dente. Reserve cup pasta water; drain pasta and transfer to a large bowl.
2. Meanwhile, cook bacon in a large nonstick skillet over medium-high until browned, about 7 minutes, pouring off and reserving fat halfway through. With a slotted spoon, transfer bacon to paper towels.
3. Add frisee to skillet and season with 1/4 teaspoon salt and 1/8 teaspoon pepper. Cook, stirring, until frisee just begins to wilt, 1 1/2 to 2 minutes. Stir in vinegar and transfer to bowl with pasta (reserve skillet). Add pasta water and toss to combine.
4. Return skillet to medium heat and add reserved bacon fat. Working in two batches, fry eggs until whites are just set and edges are golden brown, about 2 minutes. Season with salt and pepper. Serve pasta topped with Parmesan (if desired) and a fried egg.