This side dish has a great porky flavor from the pancetta, which gets simmered in water before frying to make it extra crisp.
Light a grill. Drizzle the corn with oil and rub to coat thoroughly. Grill over moderate heat, turning often, until lightly charred all over and just tender, about 15 minutes. Transfer the corn to a work surface and when cool enough to handle, cut the kernels from the cobs.
In a large, deep skillet, combine the pancetta and water and bring to a boil. Simmer over moderate heat until the water evaporates, about 4 minutes. Fry the pancetta, stirring occasionally, until crisp, about 8 minutes. Pour off all but 2 tablespoons of the fat in the skillet.
Add the garlic and red peppers to the skillet and cook, stirring, until the garlic is fragrant, about 2 minutes. Stir in the corn and vinegar and cook briefly to heat through. Remove from the heat and season with salt and pepper. Stir in the oregano leaves, transfer to a bowl and serve.