Place a couple of paper towels on a plate to drain. Set the bacon aside for later and return the pot with the bacon grease in it to the heat. Add the onions to the bacon grease and sauté.
After a few minutes when they start to become translucent add in the minced bell pepper and minced carrot. Let the veggies cook until soft and begin to have some color.
Let the butter melt completely then add in the flour and mix around. Cook for 3-5 minutes. Pour in the chicken stock and beer, mix to combine. Let simmer for 15 minutes.