Preheat the oven to 400ºF.
In a bowl, combine pork, spices, and seasonings (listed in the recipe card), and refrigerate it for 30 minutes, covered.
Add cold butter, shortening, flour, buttermilk blend, seasonings to a food processor and pulse. Stop when you see small lumps.
Place the mixture in a large bowl. Add cold water and mix well with a fork until a dough forms.
Place the dough onto a floured working surface and roll it out. Dust the dough with a little flour if it’s too wet.
Use a 4-inch round cutter to cut out four pieces of dough and remove the excess dough. The biscuits come out nicer this way.
Slide the tray into the oven and bake for 10 minutes. Brush egg yolk onto each biscuit and bake for another 5 minutes.
Meanwhile, melt butter in a pan. Add the marinated ground pork and cook for 5 minutes or until all of the fat renders out.
Add 2 tablespoons of flour and stir for 1 minute. Pour the milk in and season it with salt and pepper. Simmer for 5 minutes on low heat.