In a skillet on medium heat cook pork, onion, green pepper, red pepper flakes, and garlic until pork is crumbly. Drain off excess fat, but leave a small amount.
Combine butter, salt, and pepper with the meat mixture and stir until butter melts. Slowly sift flour over the top. Mix gently and allow mixture to cook for 5 minutes. It will burn, so do not let it sit unguarded. Don't forget to scrape the bottom of the pan. Add the sage and thyme.
Slowly stir in milk, about a half a cup at a time, and incorporate it well. When the mixture thickens, add more milk. Do not let it boil vigorously, or it will burn. Add chicken bullion and let cook for five minutes. Again, if it thickens too much, add more milk. Adjust taste with more salt and pepper if needed.
Just before serving, add the parsley, and about a 1/4 cup more milk; the gravy will thicken quickly as it cools.