Preheat the oven to 375 degrees.
Slice the whole sweet potato on a mandoline about an ? inch thick.
Drizzle with olive oil, season with salt and pepper and top with piece of prosciutto and sage leaf.
Bake for 14 minutes.
Meanwhile, combine garlic, lemon zest & juice, mayonnaise, a tiny bit of salt and some cracked black pepper in a small ramekin.
Remove from oven and serve on a platter - enjoy!