I dont know where I picked this up, but Israel does it alot
You pedal on one note in the left hand, and with the right you play the related natural minor scale ascending with major triads.
ie. Lets take the key of C
The minor scale for C is derived from Ebmajor, so the scale goes
C, D, Eb, F, G, Ab, Bb, C
Hold (pedal) this note------> C/ CEG <--------(major triad)
C/ DF#A
C/ EbGBb
C/ FAC
C/ GBD
C/ AbCEb
C/ BbDF
C/ GCE
Phatten it up by adding the fifth and the octave in your left, and add a 2 to all your right hand Chords
so it becomes
CGC/ CDEG