Add bacon to a large pan and cook over medium-high heat, about 5 minutes until cooked, but not brown. Remove and set aside. Drain the pan leaving just 1 Tbsp of bacon fat.
Add bell pepper and onion, cook, stirring 5 minutes.
Add ground pork. Break up with back of spoon and continue to cook, stirring occasionally for 8-10 minutes.
Add bacon back along with herbs and pizza sauce. Stir to heat through 2-3 minutes. At this point you can continue to make the calzones, or place filling in a sealed container in the refrigerator for up to 3 days.