To make your sausage less greasy and reduce the fat, you want to make sure to always puncture 3-4 small holes in your sausage so the fat can drain. Then bake it on a broiler pan so the fat can drip below the rack instead of sitting in the grease while it bakes. You can also cook your sausage in the Instant Pot or pot of boiling water with a small amount of water to collect the fat which is then discarded. If using this method you can give the sausages a nice seer after in the frying pan to get them nice and browned.