That is; Salt-( Kosher)/Pepper-( freshly ground)/Garlic-(powder). As there several variations I decided to give them a try..The first was the BBQ Pit Boys recipe,long gone since they started" selling" SPG . Their salt/pepper/ garlic ratio is:7/2/1.. Way too salty by my.. The ratio's are by volume.
I ended up with a 1/1/1 ratio..It is the only one I use on beef - that is one side..I grind pepper onto the first side, pat it in, turn and apply the S P G to the other..
I am trying to reduce my rub pantry down to a very few as I found I am only using 3 to 4 different rubs. Even the latest ,a super coffee rub has taken a back seat to S P G.