In a large bowl, combine the ground pork the taco seasoning and dried sage. It is best to use your hands to mix things up.
Shape the mixed sausage into patties. For a pound, you should easily be able to get 6 or 8 biscuit-sized sausage patties. If you are making your own biscuits and use a biscuit cutter, you can also use that same biscuit cutter or one a tiny bit larger as a shaping mold to shape your sausage. Just lightly oil the biscuit cutter, spoon sausage into the cutter and press down to shape into a circle.
In a medium pan over medium heat, add your formed sausage patties. Cook for at least 6 minutes per side.
While sausage is cooking, shred your lettuce, dice the tomato and shred the cheddar. This is also a good time to split your biscuit and toast it if you desire.
Once the sausage has cooked at least 6 minutes per side (check with a probe thermometer to be sure of the temperature - it needs to be at least 160 degrees F) remove the sausage patties to a paper towel lined plate to rest.
Slice biscuit, add sausage, top with lettuce, tomato, cheese and sour cream if you are using it.
Top with biscuit top, serve biscuit sandwiches and enjoy.