For the breadcrumbs, heat EVOO and butter over medium heat, melting butter into oil. Add garlic and stir 1-2 minutes. Add breadcrumbs and stir until very fragrant and deeply golden in color. Remove breadcrumbs from heat and cool; toss with parsley and cheese.
For the sauce, heat EVOO, a couple of turns of the pan, over medium-high heat in a Dutch oven. Add pancetta, guanciale or bacon and stir until rendered and crispy, 3-4 minutes. Add onions, garlic, rosemary, thyme, red pepper flakes and raisins, and stir to soften 3-5 minutes. Add white wine and stock, set cauliflower into pot, season with salt and pepper, and cover. Cook 15-20 minutes until very tender then mash up into small pieces with wooden spoon or potato masher.