Alan Kesselheim had his tamari, Derrick Booth his mixed herbs, and John Hee his Schwartz instant mash perker upper.
Me? My magic ingredient is chorizo.
Dice it and heat in a pan, add a chopped tomato or two, and some diced red or green pepper. Within a few minutes you'll have a tasty pasta sauce. Of course some of Derrick's mixed herbs wouldn't go a miss here either, but I don't think the tamari would work and John's mash mix isn't gluten free.