Lemon-Caper Spaghetti with Pancetta and Toasted Breadcrumbs

In this dish, bright, bracing lemon zest and juice perk up the savoriness of garlic, pancetta and capers, and a dusting of golden crisp breadcrumbs adds texture. This is a one-pot wonder: We cook the pasta in a minimal amount of water, and the starchy liquid that results forms a lightly thickened sauce that coats the noodles. Serve with fried eggs on top.