Hi,
seeing as I mainly race with FXR, I just floor it and turn towards the tarmac, trying to keep the car as straight and stable as possible while looking out for incoming cars (if I went too wide and clipped the grass, probabilities are that others cars will pass close to me).
I do this with either 2 or 4 wheels on the grass.
With RWD cars, just ease off on the throttle (don't let it go) and gentle bring it back on the tarmac.
Cheers
Nunes