Preheat your oven to 400°F / 200°C.
Line a baking pan with parchment paper or a silicone mat.
Place the cauliflower florets on the prepared pan.
Add the bacon grease or olive oil, season with salt and pepper, and toss to coat everything evenly.
Roast for 15 minutes.
Remove the pan from the oven.
Stir the cauliflower and scatter the torn prosciutto pieces throughout the pan.
Add the slivered almonds and capers to the mixture and stir gently to combine.
Sprinkle the grated Parmesan cheese over the top.
Return the pan to the oven and roast for another 10 minutes, or until the cauliflower is tender and the prosciutto is crispy.
Use a slotted spoon to serve immediately, leaving any excess grease behind.
Add the prosciutto in the last 10 minutes of cooking. This is the key to getting perfectly crispy prosciutto 'chips' that don't burn before the cauliflower is tender.