Enzo's Spaghetti all'Amatriciana

Heat olive oil in a large skillet over medium heat. Add guanciale and cook, stirring frequently until slightly browned, about 7 minutes. Remove guanciale to a plate. Leave a bit of the rendered fat in the skillet and discard the rest.

Add onion to the skillet and cook and stir until softened, about 5 minutes. Add garlic and red pepper flakes; cook for 1 minute. Return guanciale to the skillet and cook for 1 to 2 minutes. Pour in white wine and cook until wine has reduced slightly, about 3 minutes.

Stir in canned tomatoes, breaking up whole tomatoes with a spoon. Pour 1/3 cup water into the tomato can, swirl around to rinse the can, and pour into the skillet with remaining 2/3 cup water and tomato paste. Bring sauce to a boil. Reduce heat to low, cover, and simmer, stirring occasionally, for 1 hour.