I've never had a bad review of my sausages.
I do both mild and hot italian sausages this way.
I first saute butter and onions, peppers (green/yellow/red) in a mixture of spiced rum and cognac. Yes, my special ingredient

I cook a lot with rum and cognac.
Fire the grill up, put the sausages on and cook them pretty well, not too much. If I have time, I put the entire mixture in a crock pot. Toasted buns of course.
Though a conventional doctor may have some misgivings, the butter is a wholesome ingredient, the rum and cognac mixture is harmless. Believe it or not, the single most harmful ingredient in the entire recipe is the roll.