How to Make It
In a bowl, combine the shallot, lemon zest, lemon juice and sugar. Season with salt and pepper; let sit for 10 minutes. Whisk in 6 tablespoons of the oil. Transfer 1/4 cup of the dressing to a bowl, add the beans and parsley and let stand for 30 minutes.
In a skillet, cook the pancetta over moderate heat, stirring, until crisp, about 7 minutes. Using a slotted spoon, transfer the pancetta to a plate. Heat the remaining 2 tablespoons of oil in the skillet, then stir in the toasted bread and toss to coat.
Add the bread to the beans with the escarole and remaining dressing. Season with salt and pepper, toss and serve.