3 hours ago, Paul Bacino said:I have the RG...I think
Probably not . There's RM and GS (and one or two others), but no RG, as far as I know.
Checking out a few recipes, it seems that the usual dose is in the neighborhood of 1 - 1.3%, but most also imply that you need some stock or water along with the pureed protein. You also need to allow for setting time. Maybe this recipe will be useful.
ETA: when I've seen it done, the "injection" was done directly into boiling water, with a pastry bag and a tip appropriate for the shape desired..