Dice the bacon and cook it in a pan until it is golden brown a crispy. Strain the cooked bacon pieces through a sieve over a bowl to catch the bacon fat. Chill the bacon bits and fat in the refrigerator for 10 minutes.
Whisk together the dry ingredients (flour, baking soda, baking powder, salt, pepper, sugar) in a large bowl. Add the all of the butter and 2 tablespoons of chilled bacon fat to the flour mixture. Using a pasty cutter, or your hands, begin to cut the butter into the flour mixture until it begins to resemble coarse sand. Work quickly so that the butter does not melt.
Next, use a wooden spoon to fold in the buttermilk, reserved bacon bits, ricotta, cheddar and rosemary, just until everything comes together – do not over mix. Knead the mixture a few times in the bowl, making sure to get any of those dry bits at the bottom up into the mix. Transfer to a well-floured surface and use your hands to gently work the dough together. If the dough is too sticky, add flour until it is manageable.
Roll and shape the dough into a to rectangle, about 1.5-2 inches thick then wrap in plastic wrap and transfer to the refrigerator to rest for at least 30 minutes or up to 24 hours. Preheat your oven to 425F. Line a baking tray with parchment paper, set aside.
Once chilled, use a sharp knife to portion the dough into 12 squares. Place the scones on the reserved baking tray and brush the tops with buttermilk, then a sprinkle laky sea salt, freshly cracked black pepper and (optional) a few rosemary leaves. Bake for 20-25 minutes, rotating halfway through, until golden brown. Serve warm.